DEVELOPMENTAL BIOLOGY. For the article “Identification of a small molecule inhibitor of the hedgehog signaling pathway: Effects on basal cell carcinoma-like lesions,” by Juliet A. Williams, Oivin M. Guicherit, Beatrice I. Zaharian, Yin Xu, Ling Chai, Hynek Wichterle, Charlene Kon, Christine Gatchalian, Jeffery A. Porter, Lee L. Rubin, and Frank Y. Wang, which appeared in issue 8, April 15, 2003, of Proc. Natl. Acad. Sci. USA (100, 4616–4621; First Published April 4, 2003; 10.1073/pnas.0732813100), the authors request that Roel Nusse, Howard Hughes Medical Institute and Department of Developmental Biology, Stanford University School of Medicine, Stanford, CA 94305, be added to the list of authors between Christine Gatchalian and Jeffery A. Porter. The corrected author line appears below.

Juliet A. Williams, Oivin M. Guicherit, Beatrice I. Zaharian, Yin Xu, Ling Chai, Hynek Wichterle, Charlene Kon, Christine Gatchalian, Roel Nusse, Jeffery A. Porter, Lee L. Rubin, and Frank Y. Wang

www.pnas.org/cgi/doi/10.1073/pnas.1532938100