Peptide, polypeptide, protein — the words get used loosely, but the underlying chemistry is precise: one repeated bond, one repeated cellular assembly line, and a size boundary that isn't just semantic. How the ribosome actually builds a peptide chain, how the body tears one back down, and why that size boundary decides whether a drug can be a pill or has to be an injection.
Proteins
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What a Peptide Actually Is: The Chemistry Between an Amino Acid and a Protein