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