Bioinformatics Research Group, Artificial Intelligence Center, SRI International, Menlo Park, California 94025-3493, USA. ypouliot@stanford.edu <ypouliot@stanford.edu>|Bioinformatics Research Group, Artificial Intelligence Center, SRI International, Menlo Park, California 94025-3493, USA. ypouliot@stanford.edu <ypouliot@stanford.edu>