1. Department of Biochemistry and Molecular Biology, Oklahoma State University, Stillwater, OK 74078, USA
2. Department of Computer Science and Engineering, Washington University in St Louis, St Louis, MO 63130, USA
3. Department of Chemistry and Biochemistry, University of Oklahoma, 101 David L. Boren Boulevard, Norman, OK 73019, USA
4. Department of Genetics, Washington University School of Medicine, St Louis, MO 63110, USA