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In chemistry, an imino acid is any molecule that contains both imine and carboxyl -OH] functional groups.
Imino acids are structurally related to amino acids, which have amino group instead of imine—a difference of single vs double-bond between nitrogen and carbon. The simplest example is dehydroglycine.
D-Amino acid oxidase is an enzyme that is able to convert amino acids into imino acids. Also the direct biosynthetic precursor to the amino acid proline is the imino acid -Δ-pyrroline-5-carboxylate.
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