VOLUME 277 (2002) PAGES 5054–5060
This article has been retracted by the publisher. The same data were reused to represent different experimental conditions. Specifically, in Fig. 1, lane 3 was reused in lane 11, and lanes 9 and 10 were reused in 17 and 18. Additionally, lane 3 from Fig. 1 was reused in lane 2 from Fig. 3. Finally, lanes 2–4 from Fig. 1 were flipped horizontally and reused in lanes 5–7 from the left panel of Fig. 4.
