1. Department of Computer Science, University of Colorado, Boulder, CO 80309, USA.
2. Department of Applied Mathematics, University of Colorado, Boulder, CO 80309, USA.
3. Santa Fe Institute, Santa Fe, NM 87501, USA.
4. Department of Biostatistics and Informatics, Colorado School of Public Health, Aurora, CO 80045, USA.
5. BioFrontiers Institute, University of Colorado, Boulder, CO 80303, USA.