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Immunohistochemical analysis of HNSCC cancerous tissues from HPV-positive cases with hematoxylin counterstain; magnification, × 200. Cytoplasmic NF-κB (p65) immunostaining in moderately (a) and poorly (b) differentiated HNSCC. c Cytoplasmic p16INK4a immunohistochemical staining in moderately differentiated HNSCC. d Nuclear p16INK4a immunostaining in poorly differentiated HNSCC
