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Conservation of the five RNA polymerase III core subunits (Rpc1, Rpc2, Rpc11, Rpc17 and Rpc25) (A) Number of homologous coding sequences identified by iterative homology search, using Rpc1, Rpc2, Rpc11, Rpc17 and Rpc25 and their paralogues in RNA polymerase I and II. The additional Rpb1-like and Rpb2-like subunits of plants correspond to the recently discovered RNA polymerase IV enzyme (54). (B) Data and species symbols are as in Figure 2.
