part of part of has input has input has output has output process reaction CDP-diacylglycerol + L-serine = CMP + phosphatidylserine 1 1 1 1 1 KEGG:R01800 UPa:UCR01800 reaction METACYC:PHOSPHASERSYN-RXN RHEA:16916 phosphatidylethanolamine from CDP-diacylglycerol: step 1/2 CMP L-serine CDP-diacylglycerol phosphatidylserine