Methionine and the "methyl folate trap".
D005492:Folic Acid / Q000378:metabolism*; D006801:Humans; D008099:Liver / Q000378:metabolism*; D008715:Methionine / Q000378:metabolism*; D014806:Vitamin B 12 Deficiency / Q000378:metabolism*
D005492:Folic Acid; D008715:Methionine