Author Affiliations +
Ralph L. Keil,* Laura K. Palmer**
*RALPH L. KEIL, Ph.D., is Associate Professor, Department of Biochemistry and Molecular Biology, Penn State Hershey Medical Center, Hershey, PA 17033-0850; e-mail: rkeil@psu.edu.
**LAURA K. PALMER, Ph.D., is Assistant Professor of Biology, Division of Mathematics and Natural Sciences, Penn State Altoona, Altoona, PA 16601; e-mail: Ikp3@psu.edu.