The Salmonella typhimurium homolog, {HEAD ~ CobB}, can substitute for {TAIL ~ CobT} as a phosphoribosyl transferase during cobalamin biosynthesis  
The Salmonella typhimurium homolog , { HEAD ~ CobB } , can substitute for { TAIL ~ CobT } as a phosphoribosyl transferase during cobalamin biosynthesis
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH