Fig. 1From: Inducible expression of heat shock protein 20 protects airway epithelial cells against oxidative injury involving the Nrf2-NQO-1 pathwaySchematic diagram of animal experimental protocol. Mice were preconditioned with 0.5Â ppm O3 or filtered air for 1Â h at day 1, 3, 5 and 7. On day 10 (48Â h after the last preconditioning), mice were further stimulated with 2.0Â ppm O3 or filtered air for 3Â h. On day 11, biological measurements including differential BAL cell counting, lung histological evaluation, epithelial permeability and lung oxidative stress were performedBack to article page