http://www.cell.com/content/article/fulltext?uid=PIIS0092867406016540 Retraction Role of the Sigma Factor in Transcription Initiation in the Absence of Core RNA Polymerase Hsin-Hsien Hsu, Kuei-Min Chung, Tsung-Ching Chen, and Ban-Yang Chang (Cell 127, 317–327; October 20, 2006) We reported in this paper a series of experiments aimed at elucidating the exact function of the bacterial transcriptional specificity factor sigma (σ) and the importance of core RNA polymerase in modulating σ function. We recently identified errors where original data were processed inappropriately by the first author; these errors affect several of the figures. Thus, we wish to retract this paper. We continue to stand by the conclusions of the paper, and experiments replicating these results and conclusions will be verified and submitted for peer review at a future date. We are happy to provide reagents to anyone who wishes to repeat our experiments and would like to apologize to the scientific community for any inconvenience these errors may have caused. --

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