Vol. 177 No. 4, May 21, 2007. Page 567.
Due to an editorial error, in two instances, the original story incorrectly referred to myosin-1a as a microtubule motor. Myosin-1a is an actin-based motor.
The html and pdf versions of this article have been corrected. The error remains only in the print version.
The Rockefeller University Press