1. Department of Bioengineering, Carl R. Woese Inst. for Genomic Biol., Univ. of Illinois at Urbana-Champaign, Urbana, IL, USA
2. Department of Computer Science, Carl R. Woese Inst. for Genomic Biol., Univ. of Illinois at Urbana-Champaign, Urbana, IL, USA
3. Department of Bioengineering, Department of Physics, Carl R. Woese Inst. for Genomic Biol., Univ. of Illinois at Urbana-Champaign, Urbana, IL, USA
4. Department of Computer Science Reed College, Portland, OR, USA
5. Department of Biology Reed College, Portland, OR, USA