<p>DNA-dependent RNA polymerase catalyzes the transcription of DNA into RNA using the four ribonucleoside triphosphates as substrates. Each class of RNA polymerase is assembled from 9 to 15 different polypeptides. Rbp10 (RNA polymerase CX) is a domain found in RNA polymerase subunit 10; present in RNA polymerase I, II and III.</p>