Fig. 3

a. Immunostaining for CXCL13 in an explanted lung from an organ donor showing weak positivity in bronchial epithelium (double arrow heads a), but not in pulmonary vascular endothelial cells (arrow heads a), [Original magnification, A × 100, B × 200]. b. Immunostaining for CXCL13 in an explanted lung from a patient with idiopathic pulmonary hypertension showing positivity in pulmonary vascular endothelial cells (arrow heads A), bronchial epithelium (double arrow heads a) and perivascular lymphocytes (*a, *b) [Original magnification, A × 100, B × 200]. c. Immunostaining for CXCL13 in an explanted lung from a patient with chronic thromboembolic pulmonary hypertension showing positivity in pulmonary vascular endothelial cells (arrow heads a), bronchial epithelium (arrow heads b) and peribronchial lymphocytes (*b) [Original magnification, × 200]