BAL analysis of wt and CD34^−/− bone marrow– reconstituted mice. (A) Total cells in the BAL of wt bone marrow–reconstituted mice (wt in Ly5.1) or CD34^−/− bone marrow–reconstituted mice (CD34^−/− in Ly5.1) following OVA sensitization and challenge. (B) Differential counts of BAL cells from wt bone marrow–reconstituted mice (wt in Ly5.1) or CD34^−/− bone marrow–reconstituted mice (CD34^−/− in Ly5.1). (*P < .05 when wt are compared with CD34^−/−; n=6; error bars = SEM).