Department of Biology, University of Florida, Gainesville, FL 32611 and Department of Computer Science, Iowa State University, Ames, IA 50011, USA.|Department of Biology, University of Florida, Gainesville, FL 32611 and Department of Computer Science, Iowa State University, Ames, IA 50011, USA.|Department of Biology, University of Florida, Gainesville, FL 32611 and Department of Computer Science, Iowa State University, Ames, IA 50011, USA.