Acetyl-CoA CHaC-S CHa ERHD tranalaeatian uf butyryl s-aataacybACPwynthasechs Malonyl-CoA CHI: C CTCHICTS B-Kata HACH Fatty acid synthase ry3-aA-ACP a.kataanLACH yf-ACP 和m|NADP cOg NADPH+ CHiC CHaC CHyCHCHgCts 3.Ketobutyryl-ACP NADPH·H ② ③ a-Hydroxybutyryl-ACP