Levels of interleukin (IL)-4 (a) and interferon (IFN)-γ (b) in the bronchoalveolar lavage fluid of control rats (C), sensitized rats (S), sensitized rats treated with dexamethasone (S + D) and Allium cepa (35, 70, or 140 mg/kg BW/day) (S + AC). ** p < 0.01, *** p < 0.001, vs. group C; ++
p < 0.01, +++
p < 0.001, vs. group S; ##
p < 0.01, ###
p < 0.001, vs. group S + D.