Figure 4.

A-D Immunohistochemical staining of SP-A (A,), CK (B), KL-6 (C), and EMA (D) in lung tissue obtained from an NSIP patient. Many regenerative/hyperplastic alveolar epithelial cells expressed SP-A, CK, KL-6, and EMA in lung tissue from an NSIP patient. (Immunoperoxidase and hematoxylin, × 140).