1. Department of Pharmacology, Penn State College of Medicine, Hershey, PA 17033-0850, USA.
2. Department of Biochemistry and Molecular Biology, Penn State College of Medicine, Hershey, PA 17033-0850, USA.
3. Department of Chemistry, Pennsylvania State University, University Park, PA 16802, USA.
4. Department of Biomedical Engineering, Pennsylvania State University, University Park, PA 16802, USA.