1. Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography and Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California San Diego, La Jolla, California 92093, and Instituto de Investigaciones Científicas Avanzados y Servicios de Alta Tecnología, INDICASAT, Clayton, Edificio 175, PO Box 7250, Panamá 5, Panamá