1. Grainger Bioinformatics Center Field Museum of Natural History Chicago Illinois 60605
2. Centro Nacional de Biologia Estrutural e Bioimagem Universidade Federal do Rio de Janeiro Rio de Janeiro RJ 21941‐902 Brazil
3. Department of Biological and Environmental Engineering Cornell University Ithaca New York 14853
4. Negaunee Integrative Research Center Field Museum of Natural History Chicago Illinois 60605