GCA_000012465.1 PMN2A_1362 definition cobalt-precorrin-6A synthase GCA_000012465.1 PMN2A_1723 definition precorrin-2 C20-methyltransferase / cobalt-factor II C20-methyltransferase GCA_000012465.1 PMN2A_1727 definition possible cobalt transport protein GCA_000012465.1 PMN2A_0331 definition hydrogenobyrinic acid a,c-diamide cobaltochelatase