Fig. 1
From: Co-infection of distinct papillomavirus types in a captive North American porcupine
Anatomical and histological appearance of the papillomatous lesions. A Lesions manifested themselves as multiple exophytic black nodules on the inferior and superior lips. B Histology using a hematoxylin and eosin staining (original magnification 2× and 10x) showed papillary epidermal hyperplasia associated with moderate basket-wave hyperkeratosis, hypergranulosis and diffuse pigmentation of the epidermis