BIOPHYSICS. For the article “Single pilus motor forces exceed 100 pN,” by Berenike Maier, Laura Potter, Magdalene So, Hank S. Seifert, and Michael P. Sheetz, which appeared in issue 25, December 10, 2002, of Proc. Natl. Acad. Sci. USA (99, 16012–16017; First Published November 22, 2002; 10.1073/pnas.242523299), the authors request that Cynthia D. Long, Department of Microbiology-Immunology, Northwestern Medical School, Chicago, IL 60611, be added to the list of authors between Magdalene So and Hank S. Seifert. Dr. Long's present address is Molecular Diagnostics, Abbott Laboratories, 100 Abbott Park Road, Abbott Park, IL 60064. The revised author line appears below.
Berenike Maier, Laura Potter, Magdalene So, Cynthia D. Long, Hank S. Seifert, and Michael P. Sheetz