1. From Harbor-University of California, Los Angeles Medical Center, Los Angeles (M.M.L.); Pritzker Institute of Technology, Illinois Institute of Technology, Chicago (R.A.); Penn State University, Pittsburgh, Pa (D.G.); National Institutes of Health, Bethesda, Md (J.J.B.); and the National Heart, Lung and Blood Institute, National Institutes of Health, Bethesda, Md.