Answer :
Proteogenic amino acids are the 20 amino acids that are commonly incorporated into proteins during protein synthesis. These amino acids are categorized into two types: L-amino acids and D-amino acids.
L-amino acids are the primary type of amino acids found in human proteins. These amino acids have a specific structural arrangement in which the amino group (-NH2) is on the left side and the carboxyl group (-COOH) is on the right side of the central carbon atom. The "L" designation refers to the configuration of the chiral center in these amino acid . DL-amino acids have a reversed arrangement, with the amino group on the right side and the carboxyl group on the left side of the central carbon atom. D-amino acids are relatively rare in proteins and are mainly found in specific non-protein molecules or in certain bacterial cell wall components.DL-amino acids refer to a mixture of both L-amino acids and D-amino acids. This mixture is not commonly found in human proteins.In human proteins, only L-amino acids are considered proteogenic amino acids. These amino acids have a specific structural arrangement and play a crucial role in protein synthesis and function.
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