title: Assay of vitamin B 12 in serum and other materials.
mesh_terms: D005260:Female; D005504:Food Analysis; D006801:Humans; D008099:Liver / Q000032:analysis; D008722:Methods; D008895:Milk, Human / Q000032:analysis; D011247:Pregnancy; D014805:Vitamin B 12 / Q000032:analysis* / Q000097:blood
chemical_list: D014805:Vitamin B 12