半胱氨酸 Traditional form: 半胱氨酸 Pinyin (reading): bànguāng'ānsuān Definitions: cysteine (Cys), an amino acid mercaptoethyl amine Characters: 半 - half; semi-, incomplete 胱 - bladder 氨 - ammonia 酸 - tart, sour; spoiled; acid Traditional characters: 半 - half; semi-, incomplete 胱 - bladder 氨 - ammonia 酸 - tart, sour; spoiled; acid