Best 400+ Cell Biology Pick Up Lines That Actually Work

I’ve always loved how science and humor can come together, and in this Cell Biology Pick Up Lines collection, I feel excited to share something truly fun and engaging. I notice that when we mix creativity with biology, even complex topics like cells, DNA, and mitochondria become easy and entertaining to talk about.

In this team effort of humor and learning, we bring you a unique set of lines that can make anyone smile while also sparking curiosity about science. I believe this collection is not just about jokes, but about building connection through clever words inspired by life at a cellular level.

We have carefully created this team-driven collection so that every reader can enjoy witty, romantic, and nerdy expressions in one place. This collection is perfect for students, science lovers, and anyone who enjoys smart humor creatively blended with biology.🧫 Apple Fruit Pick Up Lines | Aeroplane Pick Up Lines | Star Pick Up Lines

Funny Cell Biology Pick Up Lines for Science Lovers

Are you made of mitochondria, because you power up every room you walk into? ⚡
I think our chemistry is stronger than any cell membrane barrier tonight. 🌙
You must be a ribosome because you keep building happiness inside me. 🍀
Every time you smile, my neurons fire faster than normal signals. 🌈
Are you ATP, because I suddenly feel energized whenever you are nearby? 🔋
You make my heart divide faster than rapidly growing stem cells. 🌸
I would cross an entire plasma membrane just to talk with you again. 🌊
Your beauty has more attraction than magnetic proteins inside a cell. ✨
You must be a nucleus because you control all my attention instantly. 💫
I think my heart skipped mitosis the moment you walked past me. 🌻
You brighten my life more effectively than chloroplasts under sunlight. ☀️
I would never need a microscope to recognize your incredible charm. 🎯
You make my dopamine levels rise faster than active cellular transport. 🎉
Are you a lysosome, because you just broke down all my nervousness? 🌹
My feelings for you are multiplying faster than bacterial cell division. 🧬
You must have perfect genes because everything about you feels flawless. 💎
I could study your smile longer than any biology textbook chapter. 📚
Your laugh spreads through my system like signals between connected neurons. 🌠
You make every boring lecture feel exciting and completely unforgettable. 🎈
Are you a protein channel, because you opened the way to my heart? 🚪
I would choose your company over any science experiment every single time. 🍂
Your kindness diffuses through the room better than oxygen in cells. 🌼
I think our connection is stronger than covalent molecular bonds. 🌍
You must be cellular respiration because you take my breath away naturally. 💨
Every conversation with you feels like discovering a groundbreaking scientific breakthrough. 🏆

Cute Cell Biology Pick Up Lines for Flirty Conversations

Are you a chromosome, because you carry all the traits I admire? 🌺
Your smile spreads warmth through me like nutrients inside healthy cells. 🍯
I think my heart found its perfect match inside your genetic code. 🎀
You make my world brighter than fluorescent cells under a microscope. 🔬
Are you a membrane receptor, because you instantly caught my signal? 🌟
Your voice calms me more than balanced homeostasis inside the body. 🍃
I would happily spend hours studying the sparkle in your eyes. 💖
You make every stressful day feel easier than simple diffusion. 🌿
My feelings for you are growing faster than cultured cells in a lab. 🧪
You must be RNA because you translate all my emotions perfectly. 🎶
I feel naturally connected to you like linked strands of DNA. 🧵
Your kindness spreads through my heart like healthy oxygen circulation. 🌞
You must be a Golgi apparatus because you package happiness beautifully. 📦
I think your smile could heal even the toughest biology exam stress. 🌷
You light up my world brighter than bioluminescent organisms underwater. 🐚
I would never mutate a thing about your amazing personality. 🍒
Your charm flows through my thoughts like ions through channels. 🌌
Are you a cell wall, because you make me feel protected instantly? 🛡️
You bring more balance to my life than perfect cellular equilibrium. 🌎
I would choose your company over every lab partner in existence. 🍓
Your beauty deserves its own chapter in every biology textbook. 📖
I feel lucky every time our paths cross like matching DNA pairs. 🍀
You make ordinary moments feel magical and scientifically impossible. 🎇
My heart reacts to you faster than neurons during reflex actions. 🌠
I think you belong in a laboratory because you are absolutely rare. 🦋

Best Cell Biology Pick Up Lines for Students and Classmates

Are you my biology notes, because I cannot stop thinking about you? ✏️
You make every classroom feel more exciting than a science fair. 🎓
I would never skip class if you sat beside me every day. 📘
Your smile improves my focus better than caffeine before exams. ☕
Are you a microscope slide, because you caught all my attention? 🧪
You make biology homework feel surprisingly enjoyable and stress-free. 🌼
I think our teamwork could earn top grades in every lab assignment. 🏅
You shine brighter than the smartest student in advanced biology class. 💡
I would study cellular respiration all night if you were my partner. 🌙
Your confidence spreads through the classroom like positive energy. 🎉
Are you DNA replication, because you keep multiplying in my thoughts? 🧬
You make every boring lecture feel entertaining and worth attending. 🍎
I would gladly share all my notes just to keep talking with you. 📒
Your intelligence impresses me more than any scientific discovery lately. 🌍
I think our connection deserves extra credit from every biology professor. 🎯
You make my pulse race faster than lab deadlines during finals week. ⏳
Are you a science experiment, because I want to know everything about you? 🔍
You make group projects feel less stressful and much more enjoyable. 🌸
I would sit through endless lectures just to hear your laugh again. 🎵
Your personality is stronger than the toughest scientific hypothesis. 🏔️
You bring more excitement into class than surprise practical exams. 🎈
I feel smarter every time we talk about science together. 📐
Your energy spreads through the room faster than electrical impulses. ⚙️
I think our chemistry deserves publication in a scientific journal. 📰
You turn ordinary school days into unforgettable memories naturally. 🌠

Romantic Cell Biology Pick Up Lines for Your Crush

Are you my nucleus, because my world revolves around your presence? 🌎
Your smile activates emotions stronger than any biological signal pathway. 💘
I think our connection is written deep inside our genetic destiny. 🌹
You make my heart beat faster than rapid neuron communication. ⚡
I would travel across every ecosystem just to see you smile again. 🌍
Your beauty outshines every colorful image inside a biology lab. 🌈
Are you ATP synthase, because you create happiness inside my soul? ✨
Every moment with you feels rare and scientifically extraordinary. 💎
You make my life brighter than chloroplasts under summer sunlight. 🌞
I think your voice could calm even the busiest human mind. 🍃
Your kindness spreads warmth through me like oxygen through blood vessels. ❤️
I would never need evolution to improve someone already this perfect. 🌺
Are you a stem cell, because you can transform my entire mood? 🌻
You make every conversation feel meaningful and emotionally unforgettable. 🎶
My feelings for you grow stronger than any biological adaptation. 🌿
You brighten ordinary days more effectively than serotonin inside neurons. 🌟
I think destiny paired us together like perfectly matching chromosomes. 🧵
Your laugh is more addictive than discovering exciting scientific facts. 🎇
I would choose your smile over every scientific award imaginable. 🏆
Are you cellular respiration, because you truly take my breath away? 💨
Your presence makes my entire world feel naturally balanced and calm. 🌙
I could spend forever exploring the beauty inside your personality. 🍂
You make my heart react faster than reflex arcs during emergencies. 🚑
I think our chemistry could survive any laboratory experiment together. 🔬
You are the only discovery my heart truly wants to keep forever. 🪐

Nerdy Cell Biology Pick Up Lines Inspired by DNA and Genes

Are you DNA helicase, because you just unraveled all my emotions? 🧬
I think our genes are perfectly compatible for something amazing. 🌠
You must be a dominant trait because you stand out naturally. 👑
Your smile is encoded deeper than information inside human chromosomes. 📖
I would sequence every strand of DNA just to understand your beauty. 🔍
You make my genetic code feel more complete than ever before. 🌷
Are you RNA polymerase, because you keep transcribing my thoughts? 🎵
Your personality deserves a permanent place inside scientific history. 🏛️
I think our connection is stronger than bonded nucleotide pairs. 🌊
You make my heart mutate into a happier version every day. 🌸
Are you a genome, because there is so much beauty to discover? 🌌
Your charm spreads faster than inherited traits across generations. 🍀
I would never edit a single thing about your incredible DNA. ✨
You make ordinary moments feel like groundbreaking genetic discoveries. 🔬
My attraction to you is more stable than perfectly replicated genes. 🛡️
You must be genetic variation because you are one of a kind. 🌻
I think your eyes contain more mystery than the entire genome project. 👀
You make every scientific discussion feel exciting and unforgettable. 📚
Are you a mutation, because you changed my life unexpectedly? 💫
Your beauty deserves recognition from every future biology student. 🏅
I could spend years studying the complexity of your personality. ⏰
You make my thoughts race faster than rapidly replicating chromosomes. 🚀
I think our chemistry belongs inside a genetics research paper. 📰
Your kindness flows naturally like inherited traits through generations. 🌼
You are the best thing evolution could have possibly created. 🌍

Hilarious Biology Pick Up Lines About Cells and Organelles

Are you a mitochondrion, because you are the powerhouse of my happiness? 🔋
I think my heart just underwent mitosis after seeing your smile. 🌸
You must be a vacuole because you fill the empty spaces perfectly. 🫧
Your beauty deserves observation under the world’s strongest microscope. 🔬
I would cross any semipermeable membrane to spend time with you. 🌊
You make my neurons connect faster than internet signals nowadays. 📡
Are you cytoplasm, because everything feels complete around you? 🌟
Your laugh spreads joy faster than proteins inside active transport. 🎈
I think you are more essential than ATP during cellular respiration. ⚙️
You make every science joke surprisingly charming and attractive. 🌷
Are you rough endoplasmic reticulum, because you make life smoother? 🍃
Your smile could brighten even the darkest laboratory classroom. 💡
I would never need a control group when choosing someone like you. 📊
You make my stress disappear faster than enzymes breaking molecules apart. 🍂
Are you Golgi bodies, because you always deliver happiness beautifully? 📦
Your personality stands out more than fluorescent dyes in biology labs. 🌈
I think our chemistry could confuse even experienced scientists. 🧪
You make every ordinary conversation feel incredibly entertaining and memorable. 🎭
Are you osmosis, because you naturally flow into my thoughts? 💧
Your charm spreads through the room like signals between neurons. 🌠
I would choose your company over any science documentary marathon. 📺
You make biology puns feel unexpectedly romantic and clever. 💞
I think you deserve your own category in modern scientific classification. 🐾
Your energy lights up the room better than laboratory equipment. 🔦
You are more fascinating than discovering a brand-new species. 🦎

Clever Cell Biology Pick Up Lines for Dating Apps

Are you a cell membrane, because you let only good vibes through? 📱
I think our chemistry deserves more than just a swipe tonight. 🌙
You make online conversations feel surprisingly genuine and exciting. 💬
Your profile caught my attention faster than neuron reflexes. ⚡
Are you ATP, because you instantly boosted my energy levels? 🔥
I would gladly delete every dating app after meeting someone like you. 🗑️
Your smile looks brighter than fluorescence inside biology laboratories. 🌟
I think our connection is stronger than scientific peer review standards. 📖
You make small talk feel fun, natural, and refreshingly interesting. 🌸
Are you DNA replication, because I cannot stop thinking about you? 🧬
Your humor spreads happiness through my system like neurotransmitters. 🎶
I would match with you in every timeline and alternate universe. 🌌
You make chemistry jokes sound way more attractive than expected. 💎
Are you a receptor protein, because you activated all my feelings? 🎯
Your personality stands out more than any profile I have seen lately. 🌷
I think our first conversation already deserves a sequel date. 🍽️
You make digital flirting feel meaningful instead of awkward. 🌿
Are you active transport, because you moved straight into my heart? 🚚
Your vibe feels more refreshing than finishing final exams early. 🎓
I would happily lose sleep just to keep messaging you tonight. 🌠
You make biology references sound smooth and effortlessly charming. 🎵
I think your smile could improve anyone’s entire mood instantly. ☀️
Your intelligence makes you even more attractive than your photos. 📸
I would rather learn about you than scroll endlessly online. 📲
You seem like the kind of person worth every bit of effort. 🌺

Smart Cell Biology Pick Up Lines for Medical and Biology Majors

Are you a neuron, because you send signals straight to my heart? 🧠
You make every anatomy lecture feel much more interesting lately. 📚
I think our chemistry belongs in a top medical journal someday. 📰
Your intelligence shines brighter than any laboratory research findings. 🔬
Are you homeostasis, because you bring balance into my chaotic life? ⚖️
You make scientific conversations feel fun instead of overwhelming. 🌈
I would study for every exam if you were my motivation. ✏️
Your confidence spreads through the room like positive neural signals. 🌟
I think your smile deserves recognition from the entire science department. 🏅
You make difficult biology concepts easier to understand naturally. 🌿
Are you the nucleus, because you organize all my thoughts perfectly? 🪐
Your energy feels stronger than caffeine during late-night study sessions. ☕
I would rather discuss biology with you than party all weekend. 🎉
You make every classroom interaction feel surprisingly memorable and exciting. 🍂
Are you a microscope, because you helped me see things clearly? 🔍
Your kindness spreads faster than helpful signals through synapses. 🌸
I think our connection could survive even the hardest finals week. 📘
You make medical school stress feel much easier to handle. 🌻
Your personality is more attractive than perfect exam grades honestly. 💯
I would trust you more than my favorite biology professor. 🎓
You make every scientific topic feel entertaining and meaningful. 🎶
Are you an enzyme, because you accelerate all my feelings instantly? ⚙️
Your ambition is as inspiring as breakthrough discoveries in medicine. 🚑
I think your smile should be considered therapeutic for stressed students. 🌼
You are exactly the type of person science lovers dream about. ✨

Cheesy Cell Biology Pick Up Lines That Actually Work

Are you osmosis, because I feel naturally drawn toward you? 💧
You make my heart react faster than enzymes during digestion. 🍕
I think your smile deserves its own scientific classification system. 📊
Your beauty spreads through the room like sunlight through chloroplasts. ☀️
Are you ATP, because you give me the energy to smile again? 🔋
You make awkward flirting feel surprisingly smooth and enjoyable. 🌷
I would survive any biology class as long as you were there. 🎒
Your laugh sounds more refreshing than weekends after stressful exams. 🌴
I think our chemistry could impress even skeptical scientists. 🧪
You make science jokes sound much cooler than they should. 😎
Are you a ribosome, because you build happiness around everyone? 🏗️
Your kindness spreads warmth faster than blood through arteries. ❤️
I would cross every laboratory just to say hello to you. 🚶
You make every conversation feel naturally fun and comfortable. 🍀
Are you mitosis, because you doubled my happiness instantly? 🌠
Your personality shines brighter than polished lab equipment. 🔦
I think your charm could improve anyone’s terrible day immediately. 🌈
You make every biology pun feel weirdly romantic and sweet. 🍓
Are you DNA, because I feel connected to you deeply? 🧬
Your smile could probably cure boredom in every classroom. 🎈
I would rather hear your laugh than any favorite song. 🎵
You make ordinary moments feel exciting and completely unforgettable. 🌌
I think our bond is stronger than cellular adhesion molecules. 🛡️
Your confidence is more attractive than perfect scientific results. 📈
You are proof that nerdy humor can actually be charming. 🐣

Dirty Minded Yet Playful Cell Biology Pick Up Lines

Are you a cell membrane, because I want to get closer carefully? 🌙
You make my pulse race faster than rapid neural activity tonight. ⚡
I think our chemistry deserves private laboratory testing sometime soon. 🔬
Your smile creates more heat than active cellular respiration naturally. 🔥
Are you ATP, because you give me energy I cannot control? 🌋
You make every innocent biology joke feel a little dangerous. 🌹
I would gladly stay after class just to flirt with you longer. 📚
Your confidence is more attractive than perfectly written lab reports. 📝
I think our connection is stronger than magnetic cellular attraction. 🧲
You make my heart beat louder than alarms during experiments. 🚨
Are you osmosis, because you slowly moved into my thoughts completely? 💧
Your charm spreads through my system like unstoppable neurotransmitters. 🌌
I would happily break every study schedule just to see you. ⌛
You make science humor feel surprisingly seductive and clever. 💋
Are you a neuron, because you stimulate all my senses instantly? 🧠
Your energy turns ordinary conversations into unforgettable moments. ✨
I think your eyes contain more mystery than advanced genetics research. 👀
You make late-night study sessions feel way more exciting lately. 🌃
Are you mitosis, because my feelings doubled after meeting you? 🌠
Your laugh affects me stronger than caffeine during finals week. ☕
I would gladly risk embarrassment just to make you smile again. 🎭
You make flirting feel natural instead of awkward and forced. 🍷
I think our chemistry could start a chain reaction instantly. ⚗️
Your beauty distracts me more than notifications during study time. 📲
You make biology sound way hotter than anyone expected. 🌺

Mitochondria Pick Up Lines Every Biology Fan Will Love

Are you mitochondria, because you are the powerhouse of my heart? 🔋
You energize my day more than coffee before morning lectures. ☕
I think your smile generates more energy than cellular respiration. ⚡
Your personality lights up every room like sparks from experiments. ✨
Are you ATP production, because you keep me going constantly? 🔥
You make my life feel fully charged and incredibly exciting. 🎮
I would never run out of energy while spending time with you. 🚴
Your laugh boosts my mood faster than instant glucose metabolism. 🍬
I think you deserve recognition from every biology student alive. 🏅
You make even stressful days feel easier to survive naturally. 🌈
Are you oxidative phosphorylation, because you leave me breathless? 💨
Your beauty shines brighter than lights inside advanced research labs. 💡
I would study mitochondria forever if you taught the lessons. 📘
You make every conversation feel powerful and completely memorable. 🌠
Are you cellular energy, because I cannot function without you? ⚙️
Your charm spreads through my thoughts like electrical impulses. 📡
I think your presence could revive anyone’s tired mood instantly. 🌻
You make biology jokes feel smarter and much more attractive. 🧪
Your confidence powers up the room better than any generator. 🔌
I would gladly skip sleep just to keep talking with you. 🌙
You make ordinary moments feel exciting and surprisingly meaningful. 🍀
I think your energy is stronger than every science drink combined. 🥤
Your smile charges my happiness levels beyond measurable limits. 📈
You make nerdy flirting sound effortlessly smooth and natural. 🎵
You truly are the powerhouse behind every good mood I have. 🌞

Cell Biology Pick Up Lines for Instagram Captions and Reels

Are you DNA, because you complete every part of my story? 📸
You make science humor look cooler than any trending video online. 🎬
I think our chemistry deserves millions of likes and comments. ❤️
Your smile belongs on every timeline and explore page instantly. 🌟
Are you mitochondria, because you power all my best moments? ⚡
You make every selfie feel more interesting and memorable naturally. 🤳
I would post biology jokes daily just to make you laugh. 😂
Your vibe spreads positivity faster than viral internet trends. 🌐
I think your beauty could break every social media algorithm. 📲
You make nerdy captions sound unexpectedly attractive and fun. 🌈
Are you ATP, because you energize every conversation online? 🔋
Your confidence shines brighter than perfectly edited photos lately. ✨
I would rather talk with you than scroll endlessly tonight. 🌙
You make every biology meme feel smarter and more entertaining. 🧪
Are you active transport, because you moved into my feed instantly? 🚚
Your personality deserves more attention than trending celebrity drama. 🎭
I think your laugh could go viral for all the right reasons. 📹
You make ordinary captions feel creative and surprisingly meaningful. 🖋️
Your smile spreads joy faster than popular online challenges. 🏆
I would repost your energy every single day without hesitation. 🔁
You make science references feel cool enough for modern dating culture. 💘
Are you a neuron, because you instantly connected with my thoughts? 🧠
Your charm stands out more than filters and editing effects. 🎨
I think our chemistry belongs in a viral relationship reel. 🎞️
You make the internet feel less boring and more genuine. 🌍

Viral Cell Biology Pick Up Lines for TikTok and Social Media

Are you a cell receptor, because you captured all my attention instantly? 🎯
Your smile deserves more views than every trending dance challenge. 💃
I think our chemistry could become the next viral sensation online. 🌐
You make science jokes feel cool enough for social media fame. 📱
Are you mitochondria, because you keep my energy levels high daily? ⚡
Your confidence shines brighter than ring lights during livestreams. 💡
I would duet every video if it meant talking with you longer. 🎤
You make every comment section feel more entertaining naturally. 📝
I think your vibe could improve anyone’s entire social feed. 🌈
Your personality spreads positivity faster than viral internet memes. 😂
Are you ATP, because you power every exciting conversation we have? 🔋
You make biology humor trendier than expected honestly. 🎬
I would gladly pause scrolling just to focus on you completely. ⏸️
Your smile could probably break the internet without even trying. 🌟
Are you DNA replication, because you stay stuck in my mind? 🧬
You make nerdy flirting look smooth and effortlessly attractive. 🎶
I think your laugh deserves its own fan base online. 🏆
Your charm is stronger than any algorithm boosting popular content. 📊
I would watch your stories before checking anything else online. 👀
You make science references feel modern, funny, and refreshingly smart. 🍀
Are you a neuron, because you connected with me instantly? 🧠
Your energy spreads through every room like positive viral content. 🌻
I think your beauty deserves more recognition than celebrity influencers. 👑
You make every interaction feel genuine instead of superficial online. 🌍
Your personality is exactly the kind of content people remember forever. 🎞️

Unique Cell Biology Pick Up Lines for Nerdy Couples

Are you my complementary DNA strand, because we fit together perfectly? 🧬
You make every science discussion feel romantic and surprisingly meaningful. 🌹
I think our relationship has stronger bonds than stable molecules. ⚛️
Your smile brightens my life more than laboratory lights ever could. 💡
Are you ATP, because you keep our relationship energized daily? 🔋
You make nerdy love stories feel real and completely unforgettable. 📖
I would rather spend Friday nights studying with you than partying. 🌙
Your personality balances mine better than cellular homeostasis. ⚖️
I think our chemistry deserves its own scientific documentary someday. 🎥
You make every ordinary date feel exciting and intellectually fun. 🍽️
Are you a microscope, because you help me see life clearly? 🔍
Your kindness spreads through my world like oxygen in healthy cells. 🌿
I would happily build a future filled with science jokes and laughter. 🏡
You make every challenge easier simply by standing beside me. 🛡️
Are you cellular respiration, because you keep my heart alive? ❤️
Your laugh feels more comforting than relaxing after difficult exams. 🌸
I think your intelligence makes you even more attractive every day. 📚
You make love and science feel like the perfect combination naturally. 🌠
I would choose your company over any scientific conference worldwide. 🌍
Your energy turns simple moments into lifelong memories instantly. 🎈
Are you a nucleus, because you are the center of my world? 🪐
Your support motivates me stronger than any inspirational speech. 🚀
I think our bond could survive every challenge life brings. 🌊
You make nerdy romance feel charming instead of awkward. 💞
You are the best discovery my heart has ever made. 🏆

FAQs

What are cell biology pick up lines?

Cell biology pick up lines are funny, flirty, and science-inspired jokes that use biological terms like DNA, mitochondria, cells, and neurons to create playful conversations. They are especially popular among students, teachers, medical professionals, and science lovers. 🧬

Why are biology pick up lines so popular online?

Biology pick up lines are popular because they combine humor, intelligence, and creativity in a memorable way. Social media users enjoy sharing clever science jokes that feel unique compared to ordinary flirting. 📱

Can cell biology pick up lines actually work in real conversations?

Yes, they can work surprisingly well when used naturally and confidently. A funny biology joke can break the ice, create laughter, and show off your personality without sounding too serious. 😄

Who uses biology-themed pick up lines the most?

These pick-up lines are commonly used by college students, biology majors, medical students, teachers, researchers, and science enthusiasts who enjoy nerdy humor and intellectual flirting. 🎓

Are biology pick up lines good for social media captions?

Absolutely. Many people use cell biology pick up lines for Instagram captions, TikTok videos, memes, dating apps, and funny science posts because they are engaging and shareable. 🌐

What makes a good cell biology pick up line?

A great cell biology pick up line should feel creative, witty, easy to understand, and playful. The best lines combine scientific references with natural humor instead of sounding forced or overly complicated. ✨

Conclusion

Cell biology humor proves that science and romance can actually work together in surprisingly fun ways. Whether you wanted clever jokes for social media, flirty one-liners for a crush, or funny science puns for friends, these cell biology pick up lines offer something for every personality and situation. 🧪

The best part about nerdy humor is that it feels memorable, creative, and different from ordinary conversations. A smart biology joke can instantly make someone smile, spark curiosity, and create a stronger connection. 🌟

Use these lines confidently, keep the tone playful, and remember that authenticity always matters more than perfection. Sometimes the funniest and simplest line creates the biggest reaction. 💫

If you enjoyed this collection, save your favorite pick-up lines, share them with fellow science lovers, and keep spreading smart humor wherever you go. 🧬

Julian Cross

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Cell Biology Pick Up Lines