Fig. 4From: Expression of MATE1, P-gp, OCTN1 and OCTN2, in epithelial and immune cells in the lung of COPD and healthy individualsOCTN1 protein expression in airway and alveolar epithelial cells and in alveolar macrophages. Paraffin sections of human lung tissue from healthy individuals (left column) and ex-smokers with COPD (right column) were immunostained with anti-OCTN1 antibody (brown) and counterstained with hematoxylin (blue). a and b Show the OCTN1 expression on the apical side of the bronchial epithelium (arrow heads). c and d Show expression of OCTN1 in the bronchiolar epithelial cells (arrow heads). e and f The expression of OCTN1 in alveolar epithelial cells (arrow heads) and alveolar macrophages (arrows). g Shows the expression of OCTN1 in alveolar type II cells (TTF1 positive cells) after co-staining with OCTN1 (green) and TTF1 (red) antibodies. Scale bar: 20 µmBack to article page