of Ecology and Evolutionary Biology and Museum of Zoology, University of Michigan, Ann Arbor, MI 48109-1079; ¶School of Dentistry, Biologic and Materials Sciences, University of Michigan, Ann Arbor, MI 48109; and **Section of Integrative Biology and Center for Computational Biology and Bioinformatics, University of Texas, Austin, TX 78712 Edited by Walter M. Fitch, University of California, Irvine, CA, and approved September 4, 2002 (received for review May 2, 2002) A gastroenterologist was…
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