VOLUME 277 (2002) PAGES 27053–27064
This article has been withdrawn by the authors. The authors of the paper have become aware that some features had been duplicated in Figs. 7, C and D, and 8G. As the original autoradiograms and scan images relating to the aforementioned figures are no longer available to investigate the matter, the authors wish to withdraw the article in the interests of maintaining their publication standards, while also respecting the highest standards of transparency and reliability of their research and of the JBC. Replica data sets for each of the figures in question that the authors state fully validate the findings and conclusions of the published article are available, and, accordingly, a revised version of the manuscript with the replica data sets can be obtained by contacting the corresponding author.