Volume 24, no. 14, p. 6215-6230, 2004. Page 6228, line 1 of Acknowledgments: “Forsberg” should read “Forsburg.”
Page 6228, line 5 of Acknowledgments: The sentence “We thank D. R. Pilch from W. M. Bonner's lab for providing the yeast phospho-H2A antibody” should be added between “microscopy” and “We also thank.”