Dictionary  ami'no ac'idBiochem. any of a class of organic compounds that contains at least one amino group, –NH2, and one carboxyl group, –COOH: the alpha-amino acids, RCH(NH2)COOH, are the building blocks from which proteins are constructed. Cf. essential amino acid. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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