Protocol for OVA sensitization and BAL analysis. (A) Schematic of the sensitization and challenges protocol used to induce asthma in wt and CD34^−/− mice. (B) Total cell counts in BAL from naive and challenged (OVA) wt and CD34^−/− mice (n=6; error bars=SEM on mean total cell counts for each group). (C) Differential count results from naive and challenged (OVA) wt and CD34^−/− mice (n=6; error bars=SEM on mean cell number for each population of each group).