Fig. 2

Pathology of the explanted native right lung. A Lower lobe shows a cystic enlargement of the alveolar walls and interstitial infiltration of lymphocytes and plasma cells (hematoxylin and eosin staining, original magnification: 40 ×). B Lower lobe shows infiltration of plasma cells with interleukin-6 (IL-6)-positivity (Immunofluorescence staining of IL-6, original magnification: 100 ×)