Correction

GENETICS. For the article “Production of transgenic rats by lentiviral transduction of male germ-line stem cells,” by F. Kent Hamra, Joel Gatlin, Karen M. Chapman, Dana M. Grellhesl, J. Victor Garcia, Robert E. Hammer, and David L. Garbers, which appeared in number 23, November 12, 2002, of Proc. Natl. Acad. Sci. USA (99, 14931–14936; First Published October 21, 2002; 10.1073/pnas.222561399), on page 14936, the last sentence of the Acknowledgments should read “This work was supported in part by the Cecil H. and Ida Green Center for Reproductive Biology Sciences, the Cecil H. and Ida Green Distinguished Chair in Reproductive Biology Sciences, the Howard Hughes Medical Institute, and National Institutes of Health Grant AI39416.” In addition, on the same page, left column, line 5, “zygates” should read “zygotes,” and in lines 6 and 7, “(6, 28)” should read “(22, 28).”