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Detection of venom in the secretory epithelium of the primary duct. Sectioned (7 μm thickness) samples were stained with (A) mouse anti-Bothrops jararaca venom serum or (B) normal mouse serum, as a negative control. The nuclear staining (blue) was performed with DAPI (4′,6′-diamidino-2-phenylindole). In panel A, the secretory epithelium was strongly stained (green) at the cytoplasm and the apical region.
