[1] Penn State Univ, Dept Vet Sci, University Pk, PA 16802 USA
[2] Penn State Univ, Ctr Mol Toxicol & Carcinogenesis, University Pk, PA 16802 USA
[3] Penn State Univ, Grad Program Biochem Microbiol & Mol Biol, University Pk, PA 16802 USA
[4] NCI, Lab Metab, Bethesda, MD 20892 USA
[5] NCI, Vet & Tumor Pathol Sect, Off Lab Anim Resources, Frederick, MD 21702 USA