A tripeptide contains three amino acid residues linked by peptide bonds. Even three residues have an order: Gly-Ala-Ser and Ser-Ala-Gly have the same residue composition but different sequences and terminal environments. Short length does not imply biological inactivity, since small peptides can participate in signalling or chemical protection. Covalent modifications and nonstandard linkages require specification beyond the simple residue count. [ref]
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