②装载 0丙二酸单酰CoA:ACP转移酶，MT CH2一C S-CoA Malonyl-CoA →CoA-SH 0 KS MT AT ACP R Fatty acid synthase complex charged ER HD with an acetyl and a malonyl group ②装载 丙二酸单酰CoA：ACP转移酶，MT