1. Center for Evolutionary and Theoretical Immunology, Department of Biology, 163 Castetter Hall, University of New Mexico, Albuquerque, New Mexico 87131-0001.
2. Zoological Museum and Institute, Biocenter Grindel, Martin-Luther-King-Platz 3, University of Hamburg, 20146 Hamburg, Germany.
3. Department of Integrative Biology, 501 Life Sciences West, Oklahoma State University, Stillwater, Oklahoma 74078.