Four groups of mice were generated based on the factorial combination of Group (CIE vs. Air) x Stress (FSS vs. no-FSS). Mice received 4 weekly cycles of CIE or Air exposure, with each week separated by a 72-hr period (stippled boxes). Following the final CIE/Air exposure cycle, mice received FSS (10-min) (denoted by red triangles) or left undisturbed in the home-cage. Separate groups of CLT, CIE, FSS, and CIE+FSS treated mice were sacrificed 4-hr following a single FSS challenge (corresponding to 3-days post-CIE/Air exposure) or 4-hr following the 5th of 5 daily FSS sessions (corresponding to 7-days post-CIE/Air exposure) – time of sacrifice denoted by asterisk.