0 CHa CH2 Malonyl group CH2 OH 0 HS Acetyl group CHa- (first acyl group) Fatty acid synthase dehydration 3 H.O C02 HS CH3-C-CH2 HS NADPH +H+ reduction 4 NADP+ NADPH +H+ CHs-CH2-CH2 reduction Saturated acyl group, lengthened by two carbons HS NADP+