IL4 and pulmonary arterial hypertension: However, we observed some significant decreases after CBNP-exposure compared to the OVA/H2O group: (i) P90 reduced IL-13 (Table 2); (ii) P90-BaP and P90-9NA decreased the number of eosinophils (Figure 1b), and reduced IL-4 (P90-BaP) or IL-1β and IL-13 (P90-9NA) (Table 2); (iii) AS-PAH reduced IL-4 and IL-1β (Table 2) in the BAL fluid.