12alpha-hydroxy-3-oxochol-4-en-24-oyl-CoA + NAD+ = 12alpha-hydroxy-3-oxochol-4,6-dien-24-oyl-CoA + NADH + H+
(4)
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12alpha-hydroxy-3-oxocholan-24-oyl-CoA + NAD+ = 12alpha-hydroxy-3-oxochol-4-en-24-oyl-CoA + NADH + H+
(3)
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3-oxochol-4-en-24-oyl-CoA + NAD+ = 3-oxochol-4,6-dien-24-oyl-CoA + NADH + H+
(2)
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3-oxocholan-24-oyl-CoA + NAD+ = 3-oxochol-4-en-24-oyl-CoA + NADH + H+
(1)
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