[1] Univ Kentucky, Dept Surg, Lexington, KY 40536 USA
[2] Univ Kentucky, Dept Neurol, Lexington, KY 40536 USA
[3] Univ Kentucky, Dept Nutr & Food Sci, Lexington, KY 40536 USA
[4] Univ Kentucky, Dept Anat & Neurobiol, Lexington, KY 40536 USA
[5] Austrian Acad Sci, Inst Mol Biol, A-5020 Salzburg, Austria