1. J. Craig Venter Institute, La Jolla, CA 92037, USA
2. Allen Institute for Brain Science, Seattle, WA 98109, USA
3. Department of Biomedical Informatics, University at Buffalo, Buffalo, NY 14203, USA
4. European Molecular Biology Laboratory, European Bioinformatics Institute, Wellcome Trust Genome Campus, Hinxton, CB10 1SD, UK
5. Department of Pathology, University of California San Diego, La Jolla, CA 92093, USA