Choline DeficiencyCholineEthioninePhosphatidylethanolamine N-MethyltransferaseGlycerylphosphorylcholineDietary SupplementsPhosphorylcholineBetaineMethionineLiverCholine KinasePhosphatidylcholinesS-AdenosylhomocysteineS-AdenosylmethionineEthanolaminesFolic AcidDietFatty LiverCholine O-AcetyltransferasePregnancyRats, Sprague-Dawley