ACP5 and bronchiolitis obliterans syndrome: For BALP or TRACP-5b levels in serum, no significant changes were observed between the BO-exo and model groups, but WSZG or Zole treatment was able to elevate BALP level and reduce TRACP-5b level in case of BO-exo education (Fig. 6A, p < 0.05 or p < 0.01).