SCGB1A1 and bronchiolitis obliterans syndrome: Specifically, CF patients had a greater proportion of CCSP+ cells when compared to lung donors (2.28% CF vs. 1.90% Donor, p < 0.05) (Figure 1B), while BO patients had a significantly lower proportion of CCSP+ PBMCs compared to donors (0.55% vs. 1.90% Donor, p < 0.05).