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What is a peptide, really?

What is a peptide, really? The word is everywhere. Here's what it actually means.
Start with amino acids. 20 standard amino acids build the proteins in your body. Join two with a peptide bond, and you have a peptide. Keep adding, and the chain grows.
2 → ~50 amino acids: usually called a peptide. Longer chains are usually called proteins. The cut-off is a convention, not a hard rule.
Size check. Peptides: Oxytocin · 9, Glucagon · 29, Insulin · 51 (on the border). Proteins: Growth hormone · 191, Albumin · 585. Numbers are amino acids.
Why size matters. Small chains are easier to make in a lab. Many are cleared from the blood quickly. Most are digested in the gut, so most peptide medicines are injected.
Peptide = a short chain of amino acids. Its size shapes how it behaves in the body. Save this · Follow @peptidesnepal Education only. Not medical advice.

→ Amino acids are the building blocks. 20 standard ones make the proteins in your body.
→ Link amino acids with peptide bonds and you get a peptide.
→ About 2–50 amino acids: usually called a peptide. Longer: usually a protein. The line is a convention.
→ Examples: oxytocin (9), glucagon (29), insulin (51), growth hormone (191).
→ Size matters: most peptides are digested in the gut, so most peptide medicines are injected.

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Before today, could you explain what a peptide is? Yes or no?

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Education only — not medical advice.

Sources

Sources 📚
• Wang L, et al. Therapeutic peptides: current applications and future directions. Signal Transduction and Targeted Therapy, 2022;7:48.
• Amino-acid counts: UniProt — OXT (oxytocin), GCG (glucagon), INS (insulin), GH1 (growth hormone), ALB (albumin).

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