The assay of vitamin B12 in human serum.
D001681:Biological Assay; D045728:Corrinoids; D006397:Hematinics; D006801:Humans; D014805:Vitamin B 12 / Q000097:blood*
D045728:Corrinoids; D006397:Hematinics; D014805:Vitamin B 12
VITAMIN B12/in blood