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Schematic diagram showing the domain structure of the α subunit of E.coli RNAP, P.patens nuclear PpRpoA and M.polymorpha chloroplast RpoA. αNTD and αCTD denote α subunit N-terminal and C-terminal domains, respectively. The gray boxes denote regions conserved in sequence between α homologs of prokaryotic, archaebacterial, chloroplast and eukaryotic RNAPs.
