The Research Collaboratory for Structural Bioinformatics at the San Diego Supercomputer Center, 9500 Gilman Drive, University of California, San Diego, La Jolla CA 92093-0505, USA. dsg@sdsc.edu|The Research Collaboratory for Structural Bioinformatics at the San Diego Supercomputer Center, 9500 Gilman Drive, University of California, San Diego, La Jolla CA 92093-0505, USA. dsg@sdsc.edu|The Research Collaboratory for Structural Bioinformatics at the San Diego Supercomputer Center, 9500 Gilman Drive, University of California, San Diego, La Jolla CA 92093-0505, USA. dsg@sdsc.edu