 cholineethanolamine kinase Ethanolamine- phosphate cytidylyltransferase phosphatidylserine synthase phosphatidylserine decarboxylase cholineethanolaminephosphotransferase PC20:38Z,11Z,14Z14:0 Ethanolamine ATP O- Phosphoethanolamine ADP H Cytidine triphosphate PP i CDP- Ethanolamine L-Serine Choline PS20:38Z,11Z,14Z14:0 PS20:38Z,11Z,14Z14:0 PE20:38Z,11Z,14Z14:0 CO 2 DG20:38Z,11Z,14Z14:00:0 Cytidine monophosphate PE20:38Z,11Z,14Z14:0 Phosphatidylcholine Biosynthesis Endoplasmic Reticulum Membrane Mitochondrial Outer Membrane Cytosol Endoplasmic Reticulum Lumen Mitochondrial Intermembrane Spance Mitochondrial Matrix Mitochondrial Inner Membrane 