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Key essential amino acids are valine, leucine, isoleucine, tryptophan and methionine.
Peptides are named by the position of tryptophan in the amino acid sequence.
Negative dietary changes are related to the deficiency of maize in the amino acids tryptophan and lysine.
Two known enzymes catabolize the essential amino acid tryptophan in mammals.
For example, eggs are high in alanine and methionine; whey protein is high in tryptophan and threonine.
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