Fig. 2
From: Wavy changes in the whiskers of domestic cats are correlated with feline leukemia virus infection
Histopathology of upper lip tissue and immunohistochemistry for FeLV p27 antigens. A No histopathological change was observed in the sinus hair follicle of the whisker. Large sinuses filled with erythrocytes are present around the follicle (normal structure). (HE stain). B The epithelial cells of follicular walls are strongly positive (brownish signals) for the p27 antigen of FeLV. The hair papilla, which consists of mesenchymal cells, is not stained (left lower angle). C The skin of the upper lip and the tissues around the whisker show positive p27 antigen staining, including the epidermis, sebaceous glands, and sweat glands. The nucleus was counterstained with hematoxylin (B and C). Bars = 500 µm (A and C), 250 µm (B)