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3β-hydroxysterol Δ7-reductase (DHCR7) is the enzyme responsible for the final step in cholesterol synthesis from 7-dehydrocholesterol (7DHC). In this enzymatic reaction, one double bond between C7 and C8 atoms in 7DHC is saturated (transformed into a single bond in cholesterol). The schematic drawing highlights (dark shade) C7 and C8 carbons and their associated hydrogen atoms on cholesterol and 7DHC.
