1.1.1.189 NAD+ - 1.1.1.189 NAD+ preferential 15-keto prostaglandin F2alpha formation 1.1.1.189 NADH - 1.1.1.189 NADH 30% less effective than NADPH 1.1.1.189 NADP+ - 1.1.1.189 NADPH -