A comparative study of the microbiological vitamin B12 assay at the laboratories of two pharmaceutical industries.
D001681:Biological Assay / Q000592:standards*; D007778:Lactobacillus / Q000378:metabolism; D009391:Nephelometry and Turbidimetry; D014805:Vitamin B 12 / Q000032:analysis*
D014805:Vitamin B 12