Vol. 205, No. 2, February 11, 2008. Pages 339–346.
The authors regret that Fig. 1 B in this paper was incorrect, as two bands were inadvertently mixed up during figure compilation. None of the conclusions presented in the paper were affected by this error. The corrected Figure 1 is shown below, and the html and pdf versions of the article have been updated.
© 2012 The Rockefeller University Press
2012