Determination of vitamin B12 in human serum by a mutant of Escherichia coli.
D001769:Blood; D045728:Corrinoids; D004926:Escherichia coli; D006397:Hematinics; D014805:Vitamin B 12 / Q000097:blood*
D045728:Corrinoids; D006397:Hematinics; D014805:Vitamin B 12
BLOOD; ESCHERICHIA COLI; VITAMIN B12/in blood