431: RNA Polymerase IV Directs Silencing of Endogenous DNA -- Herr et al. 308 (5718): 118 -- Science

RNA Polymerase IV Directs Silencing of Endogenous DNA -- Herr et al. 308 (5718): 118 -- Science:

An RNA polymerase in plants which evolved to control repetitive DNA and certain transoposons. Evolutionary hypotheses, common descent. They compare rice and Arabidopsis and generate a phylogeny showing the evolution of the novel polymerase.