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Eight amino acids are generally regarded as essential for humans: phenylalanine, valine, threonine, tryptophan, isoleucine, methionine, leucine, and lysine. Cysteine (or sulphur-containing amino acids), tyrosine (or aromatic amino acids), histidine and arginine are additionally required by infants and growing children.

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15y ago
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11y ago

Histadine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, and valine.

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Q: What are the 9 essential amino acids?
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