MEDICAL SCIENCES. For the article ‘‘Linkage disequilibrium in human populations,’’ by Christine Lonjou, Weihua Zhang, Andrew Collins, William J. Tapper, Eiram Elahi, Nikolas Maniatis, and Newton E. Morton, which appeared in issue 10, May 13, 2003, of Proc. Natl. Acad. Sci. USA (100, 6069–6074; First Published April 29, 2003; 10.1073 pnas.1031521100), due to a printer’s error, the last three col...