1. Center for Mass Spectrometry, The Department of Molecular Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, Diversa Corporation, 4955 Directors Place, San Diego, California 92121, Applied Biosystems, Foster City, California 94404, and Mass Consortium Corporation, 3030 Bunker Hill Street, San Diego, California 92109