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||"The DNA-dependent RNA polymerase (RNAP) is central to all steps of the transcription cycle (primary sources 1–5). Bacterial, archaeal, and eukaryotic cellular RNAPs are large, multisubunit enzymes. Bacterial RNAP core enzyme consists of five subunits (ß', ß, a?, aII, and ?) and has a molecular mass of ˜0.35 MDa (primary sources 1, 6). Archaeal and eukaryotic RNAP core enzymes consist of 10 to 20 subunits and have molecular masses of 0.4–0.8 MDa (primary sources 3–5, 7)."