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essential amino acid

noun, Biochemistry.
any amino acid that is required by an animal for growth but that cannot be synthesized by the animal's cells and must be supplied in the diet.
Origin of essential amino acid
1935-40 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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essential-amino-acid in Medicine

essential amino acid n.
An alpha-amino acid that is required for protein synthesis but cannot be synthesized by humans and must be obtained in the diet.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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