Vol. 191, No. 7, December 27, 2010. Pages 1333–1350.
After publication of the paper, the authors discovered an error in figure preparation. In Fig. 3 B of the original manuscript, the authors used the same mlc-11 GFP channel kymograph in both the mlc1-11 (left) and iqg1Δ (right) panels. The authors have provided the corrected image and the affected legends (Fig. 3 and Video 2). This error in figure preparation does not impact the conclusions of the paper.
The HTML and PDF versions of the article have been corrected. The error remains only in the print version.