DNA-directed RNA polymerase II subunit RPB1 (EC 2.7.7.6; EC 2.7.7.48; UniProt P24928; also known as DNA-directed RNA polymerase II subunit A, DNA-directed RNA polymerase II subunit RPB1, DNA-directed RNA polymerase III largest subunit, hRPB220, hsRPB1, RNA polymerase II subunit B1, RPBh1, RpIILS) is...