Among them,the last reaction of sulfur incorporated into cysteine is catalyzed by O-acetylserine (thiol) lyase (OASTL) from O-acetylserine (OAS) and sulphide.

• 其中，硫掺入到半胱氨酸合成的最后一步反应是由半胱氨酸合成酶(OASTL)催化O-乙酰丝氨酸(OAS)和二硫化物(sulphide)完成的。