1. Department of Cardiovascular Research, Rhône-Poulenc Rorer Central Research, Collegeville, Pennsylvania 19426, Helios Pharmaceuticals, 9800 Bluegrass Parkway, Louisville, Kentucky 40299, Absorption Systems, 440 Creamery Way, Exton, Pennsylvania 19341, and Behring Diagnostics Inc., 151 University Avenue, Westwood, Massachusetts 02090