CDP-diacylglycerol---serine O-phosphatidyltransferase; phosphatidylserine synthase; CDPdiglyceride-serine O-phosphatidyltransferase; PS synthase; cytidine 5'-diphospho-1,2-diacyl-sn-glycerol (CDPdiglyceride):L-serine O-phosphatidyltransferase; phosp • • •