1. Section of Integrative Biology and Center for Computational Biology and Bioinformatics, The University of Texas at Austin Austin, Texas, 78712, USA E-mail: dhillis@mail.utexas.edu (D.M.H.)
2. Department of Mathematics and Computer Science, Lehman College–City University of New York Bronx, New York, 10468, USA E-mail: stjohn@lehman.cuny.edu