- Biosynthesis of vitamin B12 in anaerobic bacteria. Experiments with Eubacterium limosum on the incorporation of D-[1-13C]erythrose and [13C]formate into the 5,6-dimethylbenzimidazole moiety. Munder, M., Vogt, J.R., Vogler, B., Renz, P. Eur. J. Biochem. (1992)