title: Microbiological assay of vitamin B12 in biological fluids. The Lactobacillus leichmannii method.
mesh_terms: D000818:Animals; D001681:Biological Assay / Q000379:methods*; D003470:Culture Media; D005069:Evaluation Studies as Topic; D006801:Humans; D007778:Lactobacillus / Q000378:metabolism*; D014805:Vitamin B 12 / Q000097:blood*
chemical_list: D003470:Culture Media; D014805:Vitamin B 12