Amino acid (or amino acid): Basic element possessing both amine and acid functions; one of twenty naturally occurring organic substances that serve as the basic structural units of proteins.
Depending on its needs, the human organism is able to synthesize most of them. Nine amino acids are essential to it: isoleucine, histidine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan and valine; no synthesis of lysine and ...
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