Acclimation & testing periods
14 inbred strains of male mice were obtained from the Jackson Laboratory (JAX®, Bar Harbor, ME) at 5-6 wks of age 7 wks of age at the start of the experiment NTP-2000 wafer diet (Zeigler Brothers, Inc., Gardners, PA) Water was give ad libitum polycarbonate cages 20.6-23.9°C ambient temperature 35-65% Sani-Chips irradiated hardwood bedding (P.J. Murphy Forest Products Corp., Montville, NJ) 12h:12h light-dark cycle Care of mice followed institutional guidelines under a protocol approved by the Institutional Animal Care and Use Committee at the University of North Carolina at Chapel Hill.