[1] Scripps Res Inst, Dept Cell Biol, La Jolla, CA 92037 USA
[2] Novartis Res Fdn, Genom Inst, San Diego, CA 92121 USA
[3] Natl Inst Med Res, Div Parasitol, London NW7 1AA, England
[4] USN, Med Res Ctr, Malaria Program IDD, Silver Spring, MD 20910 USA
[5] Loyola Univ, Dept Biol, Chicago, IL 60626 USA