Department of Computer Science and C.S. Bond Life Sciences Center, University of Missouri, Columbia, MO 65211, USA.|RCSB Protein Data Bank, San Diego Supercomputer Center.|RCSB Protein Data Bank, San Diego Supercomputer Center.|RCSB Protein Data Bank, San Diego Supercomputer Center.|RCSB Protein Data Bank, San Diego Supercomputer Center.|Department of Computer Science and C.S. Bond Life Sciences Center, University of Missouri, Columbia, MO 65211, USA.|RCSB Protein Data Bank, San Diego Supercomputer Center.|RCSB Protein Data Bank, San Diego Supercomputer Center.