title: How vitamin B12 acts.
mesh_terms: D000748:Anemia, Macrocytic / Q000209:etiology*; D000749:Anemia, Megaloblastic / Q000209:etiology* / Q000378:metabolism; D000818:Animals; D005492:Folic Acid / Q000378:metabolism; D006801:Humans; D008715:Methionine / Q000096:biosynthesis; D011624:Pteroylpolyglutamic Acids / Q000096:biosynthesis; D012436:S-Adenosylmethionine / Q000378:metabolism; D013936:Thymidine / Q000096:biosynthesis; D014806:Vitamin B 12 Deficiency / Q000150:complications* / Q000378:metabolism
chemical_list: D011624:Pteroylpolyglutamic Acids; D012436:S-Adenosylmethionine; D005492:Folic Acid; D008715:Methionine; D013936:Thymidine