Vol. 176 No. 1, January 1, 2007. Pages 27–33.

During the production process, certain means of support were mistakenly left out of the acknowledgement section. The clarified paragraph appears below.

We thank M. Ikebe, K. Kaibuchi, E. Lemichez, and S. Tsukita for providing materials; M. Furuse and A.E. Baer for help; T. Kataoka, Y. Sawada, S. Yamada, I. Arima, and E. Yokoi for consistent support; and Y. Takai for providing materials and support. We also thank all the members of the Sheetz laboratory for their kind cooperation.