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Meaning of ESSENTIAL AMINO ACID

 
WordNet Dictionary
 
 Definition: 
[n]  an amino acid that is required by animals but that they cannot synthesize; must be supplied in the diet
 
 See Also: amino acid, aminoalkanoic acid, arginine, histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, tryptophane, valine

 

 

Biology Dictionary
 
 Definition: Any amino acid that can't be synthesized by an organism and must be taken in as a nutrient; in humans, about half of the 20 amino acids we use for growth and metabolism are essential.
 

 

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