![]() ![]() In humans, arginine is produced when proteins are digested. Only the l-stereoisomer participates in the biosynthesis of proteins. Its low reactivity contributes to the simple, elongated structure of silk with few cross-links which gives the fibers strength, stretch resistance and flexibility. Finally, abbreviations used for amino acid residues with more than one potential identity, and the termination codon are shown in red to complete the alphabet of single letter abbreviations.ĭiscovered in protein in 1875, alanine makes up 30% of the residues in silk. ![]() In addition, pyrrolysine, used in the biosynthesis of proteins in some archaea and bacteria but not present in humans, and selenocysteine, a cysteine analogue only found in some lineages, are included in blue. This table shows the abbreviations and single letter codes used for the 20 amino acids found in proteins. This chart shows the chemical structures of the 20 amino acids that make up proteins. ![]()
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