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Aminotransfer reaction atween an amino acid and an alpha-keto acid. The amino (NH2) group an the keto (=O) group are excheenged.

In biochemistry, a transaminase or an aminotransferase is an enzyme that catalyzes a teep o reaction atween an amino acid an an α-keto acid. Thay are important in the seenthesis o amino acids, that form proteins. In medicine, thay are an important indicator o liver damage.