IL-10 released by BAL (A) and bone marrow cells (B) 24 h after in vivo antigen challenge of allergic rats (Sham-OVx and OVx). Rats of OVx allergic groups were treated with estradiol or progesterone before the antigen challenge. Basal values were obtained from nonmanipulated rats. Data are means ± SE from 5-8 experiments. *P < 0.05 compared with the basal group; ϕ P < 0.05 compared with the Sham-OVx group; Δ P < 0.05 compared with the untreated OVx allergic group.