[On the determination of "free" vitamin B12 in the blood serum with B. coli].
D045728:Corrinoids; D004926:Escherichia coli; D006397:Hematinics; D044967:Serum; D014805:Vitamin B 12 / Q000097:blood*
D045728:Corrinoids; D006397:Hematinics; D014805:Vitamin B 12
ESCHERICHIA COLI; VITAMIN B 12/blood