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The content of flavins and vitamin B12 was studied in the cultures of Propionibacterium shermanii. The limited ability of propionic bacteria to synthesize 5,6-dimethylbenzimidazole, the nucleotide base in the true forms of vitamin B12, was found to be caused by a deficiency of the biogenetic precursor (riboflavin). Exogenous 5,6-dimethylbenzimidazole had no(More)
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