Fig. 3

a–d The case of poorly differentiated (G3) oral squamous cell carcinoma (a, b Hematoxylin and Eosin staining) that was diffusely and strongly positive for LMP1 protein of EBV (c, d); This cancer also strongly co-expressed E6 protein of HPV (the image in the right upper corner of b) (a–c ×4 magnifications; b–d ×20 magnifications)