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The distinction between essential and non-essential amino acids is somewhat unclear, as some amino acids can be produced from others. The sulfur-containing amino acids, methionine and homocysteine, can be converted into each other but neither can be synthesized de novo in humans. Likewise, cysteine can be made from homocysteine but cannot be ...
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Download as PDF; Printable version; ... Essential amino acids (11 P) Essential fatty acids (5 P) V. Vitamins (10 C, 26 P) Pages in category "Essential nutrients"
Structure of a typical L-alpha-amino acid in the "neutral" form. Amino acids are organic compounds that contain both amino and carboxylic acid functional groups. [1] Although over 500 amino acids exist in nature, by far the most important are the 22 α-amino acids incorporated into proteins. [2]
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As such it is essential that these amino acids be supplied by the organism's diet. In case of humans there are 9 EAAs: histidine , isoleucine, leucine , lysine, methionine , phenylalanine, threonine , tryptophan, and valine .