含碗美 HS-CH-CH-COOH 半胱氨酸Cys NH2 CH S-CH2 CH2-CH-COOH 蛋氨酸Met NH2 www.themegallery.com LOGO www.themegallery.com LOGO 含硫类 CH COOH NH2 CH2 CH2 CH3 S 蛋氨酸Met CH COOH NH2 HS CH2 半胱氨酸Cys