MSH: Members of the class of compounds composed of AMINO ACIDS joined together by peptide bonds between adjacent amino acids into linear, branched or cyclical structures. OLIGOPEPTIDES are composed of approximately 2-12 amino acids. Polypeptides are composed of approximately 13 or more amino acids. PROTEINS are linear polypeptides that are normally synthesized on RIBOSOMES.,CSP: chemical bond with the structure -CO-CHR-NH-; in biochemistry, polymers of alpha-aminoacids joined by peptide bonds.,CHV: a kind of chemical compound,CHV: a kind of chemical compound,NCI: A compound of two or more amino acids where the alpha carboxyl group of one is bound to the alpha amino group of another. Peptides are smaller than proteins and the dividing line is around 50 amino acids.