1. Please E-mail correspondence to . Steve Horvath is an Assistant Professor in the Departments of Human Genetics and Biostatistics, Gonda Center, University of California, Los Angeles,CA90095-7088. Tao Shi is a Senior Bioinformatics Scientist, Ortho-Clinical Diagnostics, a Johnson & Johnson Company, 3210 Merryfield Row, San Diego, CA 92121, and graduated with a Ph.D. in Human Genetics from UCLA .