1. Department of Biology, University of New Mexico, Albuquerque, NM 87131, USA
2. Department of Computer Science, University of New Mexico, Albuquerque, NM 87131, USA
3. Santa Fe Institute, 1399 Hyde Park Road, Santa Fe, NM 87501, USA
4. Los Alamos National Laboratory, Los Alamos, NM 87545, USA
5. Department of Biological Science, Missouri University of Science and Technology, Rolla, MO 65409, USA