Figure 10 Representative immunohistochemical analysis of (B, E) collagen 1 and (C, F) CCR7 in SLBs from (A–C) UIP and (D–F) RBILD patient groups. Panels (A) and (D) show control staining. Collagen 1 immunoreactivity (red staining) was present in (B) UIP and (E) RBILD patient groups. However, in serial histological sections, areas that were immunoreactive for collagen 1 lacked CCR7 expression (C, UIP; F, RBILD). Original magnification, ×200. CCR7, CC chemokine receptor 7; RBILD, respiratory bronchiolitis/interstitial lung disease; SLB, surgical lung biopsy; UIP, usual interstitial pneumonia.