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Cat K mRNA expression in BPD. In situ hybridization using a 35S-labeled antisense riboprobe specific for cat K was performed. Shown are paired bright and dark-field views of lung sections hybridized in situ for cat K mRNA. Positive signal is visible as white silver grains in the dark-field view. Note individual positive cells localizing to perivascular areas. Scale bar, 100 μm.
