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  2. Essential amino acid - Wikipedia

    en.wikipedia.org/wiki/Essential_amino_acid

    An essential amino acid, or indispensable amino acid, is an amino acid that cannot be synthesized from scratch by the organism fast enough to supply its demand, and must therefore come from the diet. Of the 21 amino acids common to all life forms, the nine amino acids humans cannot synthesize are valine, isoleucine, leucine, methionine ...

  3. Amino acid - Wikipedia

    en.wikipedia.org/wiki/Amino_acid

    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] Only these 22 appear in the genetic code of life. [3][4]

  4. Histidine - Wikipedia

    en.wikipedia.org/wiki/Histidine

    Histidine. Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Histidine (symbol His or H) [2] is an essential amino acid that is used in the biosynthesis of proteins. It contains an α-amino group (which is in the protonated –NH 3+ form under biological conditions), a carboxylic ...

  5. Category:Essential amino acids - Wikipedia

    en.wikipedia.org/wiki/Category:Essential_amino_acids

    Pages in category "Essential amino acids" The following 11 pages are in this category, out of 11 total. This list may not reflect recent changes. ...

  6. Essential amino acids in plant food - Wikipedia

    en.wikipedia.org/wiki/Essential_amino_acids_in...

    Essential amino acids in plant food. Essential amino acids (EAAs) are the amino acids required by an organism for building proteins but which cannot be synthesized by the organism itself. 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 ...

  7. Proteinogenic amino acid - Wikipedia

    en.wikipedia.org/wiki/Proteinogenic_amino_acid

    The essential amino acids are histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, and valine (i.e. H, I, L, K, M, F, T, W, V). [3] The proteinogenic amino acids have been found to be related to the set of amino acids that can be recognized by ribozyme autoaminoacylation systems. [4] Thus, non-proteinogenic ...

  8. Aromatic amino acid - Wikipedia

    en.wikipedia.org/wiki/Aromatic_amino_acid

    Animals obtain aromatic amino acids from their diet, but nearly [a] all plants and some micro-organisms must synthesize their aromatic amino acids through the metabolically costly shikimate pathway in order to make them. Histidine, phenylalanine, tryptophan, are essential amino acids for animals. Since they are not synthesized in the human body ...

  9. Protein quality - Wikipedia

    en.wikipedia.org/wiki/Protein_quality

    Protein quality. Protein quality is the digestibility and quantity of essential amino acids for providing the proteins in correct ratios for human consumption. There are various methods that rank the quality of different types of protein, some of which are outdated and no longer in use, or not considered as useful as they once were thought to be.

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