XDH and bronchiolitis obliterans syndrome: XO expression was significantly increased in the BO-group (Control vs. BO; 100 ± 29 vs. 186 ± 49%, P < 0.05 vs. Control), and the increase was suppressed by Cap (BO vs. BO + Cap; 186 ± 49 vs. 112 ± 22%, P < 0.05 vs. BO) (Fig. 5D).