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The 13-subunit Sulfolobus solfataricus RNAP structure (PDB: 3HKZ). The α-carbon backbone is shown as cartoon model, along with the transparent molecular surface. Each subunit is denoted by a unique color and labeled. Two sets of nomenclatures, one for traditional and another is based on the eukaryotic terminology proposed by Korkhin et al., are shown. Various structural features discussed in the text are also labeled. Color version of the figure is available online.
