Taurine
Taurine is a naturally occurring organic compound with the chemical formula H2N−CH2−CH2−SO2−OH in its non-zwitterionic form and H3N+−CH2−CH2−SO−3 in its zwitterionic form, and is a non-proteinogenic amino sulfonic acid widely distributed in mammalian tissues and organs. Structurally, by containing a sulfonic acid group instead of a carboxylic acid group, it is not involved in protein synthesis but is still usually referred to as an amino acid; however, being non-proteinogenic, it is not a component of the genetic code and is distinguished from the protein-building α-amino acids.
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