Levels of catalase (CAT) (a), superoxide dismutase (SOD) (b), and thiol (c) in the bronchoalveolar lavage fluid of control rats (C), sensitized rats (S), sensitized rats treated with dexamethasone (S + D) and Allium cepa (35, 70, and 140 mg/kg BW/day) (S + AC). *** p < 0.001 vs. group C; +
p < 0.05, ++
p < 0.01, +++
p < 0.001, vs. group S; ##
p < 0.01, ###
p < 0.001, vs. group S + D.