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A peptide bond is a chemical bond formed between two amino acids. This occurs through a condensation reaction where a molecule of water is released, linking the carboxyl group of one amino acid to the amino group of another. Amino acids joined by peptide bonds form a peptide. Small chains are called oligopeptides, while larger ones are polypeptides, which make up proteins.12

A related concept is the disulfide bridge, which forms between two cysteine amino acids. This bond is crucial for the shape and function of structural proteins like keratin. Neuroactive peptides are shorter than proteins but longer than typical neurotransmitters, playing roles in the nervous system.34

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