1. Joint Genome Institute, Lawrence Berkeley National Laboratory, Berkeley California, USA
2. Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, California, USA
3. Applied Math and Computational Research Division, Lawrence Berkeley National Laboratory, Berkeley, California, USA
4. Department of Electrical Engineering and Computer Sciences, University of California, Berkeley, California, USA
5. Life & Environmental Sciences Department, University of California Merced, Merced, California, USA