title: Evidence against defective thymidylate synthetase being the main biochemical lesion in vitamin B12 deficiency.
mesh_terms: D006801:Humans; D008780:Methyltransferases / Q000378:metabolism*; D013940:Thymidylate Synthase / Q000378:metabolism*; D014806:Vitamin B 12 Deficiency / Q000201:enzymology*
chemical_list: D008780:Methyltransferases; D013940:Thymidylate Synthase