MBL2 and Buschke-Ollendorff syndrome: Similarly, patients with BOS 0 < 5 years post-lung transplant had significantly lower levels of MBL compared to lung transplant patients < 5 years with BOS Op-3, 1808 ± 345 ng/ml vs. 3198 ± 370 ng/ml, p = 0.009 (Figure 4A).