... al., Multidrug resistance-associated protein- 1 (MRP1) genetic variants, MRP1 protein levels and severity of COPD Respira-tory Research 2010, 11:60 Budulac et al. Respiratory Research 2010, ... provided the original work is properly cited.ResearchMultidrug resistance-associated protein- 1 (MRP1) genetic variants, MRP1 protein levels and severity of COPDSimona E Budulac1, Dirkje ... obstructive pulmonary disease: role of bronchiolar mast cells and macrophages. Am J Pathol 1997, 151:1785-1790.Additional file 1 MRP 1genetic variants, MRP1 protein levels and severity of COPD.Additional...