1. Sanders‐Brown Research Center on AgingUniversity of KentuckyLexington Kentucky 40536 USA
2. Department of NeurologyUniversity of KentuckyLexington Kentucky 40536 USA
3. Department of Anatomy and NeurobiologyUniversity of KentuckyLexington Kentucky 40536 USA
4. Laboratory of NeurosciencesNational Institute on AgingBaltimore Maryland 21224 USA