Department of Bioinformatics and Computational Biology, Laboratory for Structural Bioinformatics, George Mason University, 10900 University Blvd, MSN 5B3, Manassas, VA 20110, USA.|Department of Bioinformatics and Computational Biology, Laboratory for Structural Bioinformatics, George Mason University, 10900 University Blvd, MSN 5B3, Manassas, VA 20110, USA.