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Biosynthesis of tauroursodeoxycholic acid. Detailed description in the text. CYP7A1—microsomal cholesterol 7a-hydroxylase; CYP27A1—27-hydroxylase; HSD3B7—3β-hydroxy-Δ5-C27-steroid dehydroxylase; CYP7B1—oxysterol 7α-hydroxylase; UDCA—ursodeoxycholic acid; TUDCA—tauroursodeoxycholic acid.
