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Definition of nonessential amino acid
: any of various amino acids that are required for normal health and growth, that can be synthesized within the body or derived in the body from essential amino acids, and that include alanine, asparagine, aspartic acid, cystine, glutamic acid, glutamine, glycine, proline, serine, and tyrosine — compare essential amino acid
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Time Traveler for nonessential amino acid
The first known use of nonessential amino acid was in 1952
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