Mammalian Methylmalonyl Isomerase and Vitamin B12 Coenzymes Lengyel, Peter ; Mazumder, Rajarshi ; Ochoa, Severo Abstract Publication: Proceedings of the National Academy of Science Pub Date: October 1960 DOI: 10.1073/pnas.46.10.1312 Bibcode: 1960PNAS...46.1312L