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VOLUME 277 (2002) PAGES 16048–16058
This article has been withdrawn by the authors. The Journal questioned Figs. 1B and 6B. The authors state they were able to locate original data for Figs. 1B and 6B, which they believe support the published results. The authors stand by the reproducibility of the experimental data and the conclusions of the paper. The paper, with confirmatory data supporting the results, can be obtained by contacting the authors.
