Typically,modified amino acids,those with side chain modifications that are present in proteins

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Modified amino acids are typically formed by the modification of standard side chain residues after the protein is synthesized. These modifications can include phosphorylation, glycosylation, acetylation, or methylation, among others. Genetic mutations or specialized bacterial enzymes are not usually involved in the formation of modified amino acids in proteins. Modified amino acids are not necessarily toxic, and they may or may not be racemic depending on the chemical modification.

Typically,modified Amino Acids,those with Side Chain Modifications That Are Present