Sergei Graiff
There are 20,000 distinct protein-coding genes. Over 100,000 distinct protein varieties Only 20 amino acids out of the hundreds found in nature are used as the nitrogenous building blocks for molecules like hormones and neurotransmitters. Amino acids are necessary for the synthesis of every protein found in the human body as well as the majority of other forms of life. These 20 amino acids are all L-isomers and alpha amino acids. All of these amino acids, with the exception of glycine and cysteine, are L-isomers with an Rabsolute configuration. The 21st amino acid is pyrrolysine, and the 22nd is selenocysteine. Humans do not need pyrroloysine to make proteins. These 22 amino acids may go through a post-translational modification after translation to broaden the range of proteins generated.
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