Figure 6

Immunohistochemistry with Ki-67. From left to right, original magnification x 10 (A, C, E), x 40 (B, D, F). The x 40 magnified area is identified by a rectangle. Counterstain: hematoxilin. A-B: Control lung; absence of Ki-67 expression. C-D: CCAM; Ki-67 is expressed in scattered mesenchymal cells. E-F: type I PPB; Ki-67 expression in mesenchymal cells within the cystic wall.