Acclimation and testing periods
Vendor Mice were obtained from The Jackson Laboratory (JAX®, Bar Harbor, ME) Acclimation 1 wk Ages Mice shipped at 5-6 wks of age; tested 9-11 wks of age Feed Pico rodent chow 20; Purina, St Louis, MO, USA, was made available ad libitum Water Water was made available ad libitum HousingMice were housed in an SPF barrier colony and in groups of 2-4 in standard high efficiency particulate air-filtered polycarbonate mouse cages. Bedding A layer of Bed-o-cob bedding and one cotton nestletHumidity 35-65% Photoperiod Animals were maintained on a 12-h light: 12-h dark cycle; All behavioral testing was conducted during the light part of the light/dark cycle and occurred between the hours of 1300h and 1600h. Temperature 22 +/- 1.0°C Regulatory compliance All procedures were conducted in strict compliance with the policies on animal welfare of the National Institutes of Health and the University of North Carolina (stated in the "Guide for the Care and Use of Laboratory Animals," Institute of Laboratory Animal Resources, National Research Council, 1996 edition), and approved by the University of North Carolina Animal Care and Use Committee.