CELL BIOLOGY. For the article “Prospective identification of tumorigenic breast cancer cells,” by Muhammad Al-Hajj, Max S. Wicha, Adalberto Benito-Hernandez, Sean J. Morrison, and Michael F. Clarke, which appeared in issue 7, April 1, 2003, of Proc. Natl. Acad. Sci. USA (100, 3983–3988; First Published March 10, 2003; 10.1073/pnas.0530291100), the authors note that the following statement was inadvertently omitted from the acknowledgements: “The results of this study support a patent-pending technology that is exclusively licensed to Cancer Stem Cell Genomics (CSCG) in which the authors and the University of Michigan have a financial interest.”
www.pnas.org/cgi/doi/10.1073/pnas.1131491100