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Dipeptidyl peptidase-1 (DPP4) expression in the respiratory tract tissues of rabbits. DPP4 is detected using immunohistochemistry and indicated in red in the figure. Type II cells are indicated with arrows, and type I cells with an arrowhead. Nasal epithelium and bronchiolar epithelium pictures were taken at a 400× magnification, and alveolar epithelium at 1000×. The isotype control showed no background signal in our assay.
