[1] Univ Calif Irvine, Dept Microbiol & Mol Genet, Emerging Dis Lab, Irvine, CA 92697 USA
[2] Univ Calif Irvine, Dept Anat & Neurobiol, Emerging Dis Lab, Irvine, CA 92697 USA
[3] Univ Calif Irvine, Dept Neurol, Emerging Dis Lab, Irvine, CA 92697 USA
[4] Univ Oxford, Dept Zool, Oxford OX1 3PS, England
[5] Univ Calif Irvine, Dept Biol Chem, Irvine, CA 92717 USA
[6] Univ Queensland, Dept Microbiol & Parasitol, Brisbane, Qld, Australia