Department of Computer Science, The Bioinformatics Program and The W. Harry Feinstone Center for Genomics Research, The University of Memphis, Memphis, TN 38152, USA. vphan@memphis.edu|Department of Computer Science, The Bioinformatics Program and The W. Harry Feinstone Center for Genomics Research, The University of Memphis, Memphis, TN 38152, USA. vphan@memphis.edu