Response to an assay of vitamin B12 by a mutant Escherichia coli.
D001681:Biological Assay; D045728:Corrinoids; D004926:Escherichia coli; D006397:Hematinics; D014805:Vitamin B 12 / Q000032:analysis*
D045728:Corrinoids; D006397:Hematinics; D014805:Vitamin B 12
ESCHERICHIA COLI; VITAMIN B12/determination