Correction

GENETICS. For the article “Conserved characteristics of heterochromatin-forming DNA at the 15q11-q13 imprinting center” by John M. Greally, Todd A. Gray, James M. Gabriel, Li qun Song, Sharon Zemel, and Robert D. Nicholls, which appeared in number 25, December 7, 1999, of Proc. Natl. Acad. Sci. USA (96, 14430–14435), the authors note the following correction. The institutional affiliation of Todd A. Gray, James M. Gabriel, and Robert D. Nicholls is the Department of Genetics, Case Western Reserve University School of Medicine and Center for Human Genetics, University Hospitals of Cleveland, Cleveland, OH 44106. The institutional affiliation of Li qun Song and Sharon Zemel is the Department of Pediatrics, Yale University School of Medicine, 333 Cedar Street, New Haven, CT 06520.