1. Department of Molecular Biology and The Center for Mass Spectrometry, The Scripps Research Institute, La Jolla, California 92037, Mass Consortium Corporation, San Diego, California 92109, Laboratory of Proteomics and Analytical Technologies, SAIC-Frederick, Inc., National Cancer Institute, Frederick, Maryland 21702, and Departments of Molecular and Integrative Neuroscience and Infectology, The Scripps Research Institute, La Jolla, California 92037