. "This short 60-residue long bacterial family is the beta subunitof the DNA-directed RNA polymerase, likely to be EC:2.7.7.6. It is membrane-bound and is referred to by the name EpuA. " . "EpuA" . "DNA-directed RNA polymerase subunit beta" . "Mistry J, Coggill P" . "Family" . . . . . . . . . . . . . . . . . . . . . .