Uptake, anabolism, catabolism, and secretion of PC in the liver. LysoPC, lysophosphatidylcholine; MDR2, multiple drug–resistant protein 2; PC, phosphatidylcholine; PE, phosphatidylethanolamine; PEMT, phosphatidylethanolamine N-methyltransferase; PS, phosphatidylserine; SM, sphingomyelin. Reproduced with permission from reference 12.