Fig. 1From: Considering choline as methionine precursor, lipoproteins transporter, hepatic promoter and antioxidant agent in dairy cowsa Methylation reaction pathway of homocysteine, to form essential amino acid methionine and another choline metabolite betaine, dependent pathway as methyl donor for methylation of homocysteine for methionine formation and b demonstrated that methionine as a universal donor of S-adenosyl methionine (SAM) which contribute to convert phosphatidylethanolamine into phosphatidylcholine to generates cholineBack to article page