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c-FLIP is localized to alveolar epithelial cells, but is absent from myofibroblasts and fibroblasts located in fibroblastic foci in patients with IPF/UIP. (A–C) Serial section from a single block stained for (A) c-FLIP, (B) cytokeratin, and (C) CD68. (D–F) Serial section from a single block stained for (D) c-FLIP, (E) α-smooth muscle actin, and (F) vimentin (×20 objective for all micrographs).
