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Definition of Amino acid, essential

Amino acid, essential: An amino acid that cannot be made by humans and so is essential to the human diet. There are 9 essential amino acids: histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, and valine.

Source: MedTerms™ Medical Dictionary
http://www.medicinenet.com/script/main/art.asp?articlekey=22838
Last Editorial Review: 6/14/2012

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