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Bronchial proliferation following naphthalene-induced Clara cell depletion. Corn oil (A, F, K) or naphthalene-treated mice were recovered 1.5 days (B, G, L), 3 days (C, H, M), 6 days (D, I, N), or 9 days (E, J, O) and injected with BrdU 2 hours before sacrifice. Adjacent serial sections from each experimental group were analyzed by dual immunofluorescence for CCSP (A to E, red) and BrdU (green), GSI-B4 binding site (F to J, green) and BrdU (red), or K14 (K to O, green) and BrdU (red).
