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HER3 and HER4 immunohistochemistry in canine melanoma. a) Cytoplasmatic moderate (2+) immunostaining for HER3 in cutaneous melanoma. b) Nuclear moderate (2+) immunostaining for HER3 in oral melanoma. c) Membrane immunostaining moderate (2+) for HER4 in cutaneous melanoma. d) Nuclear and cytoplasmatic immunostaining weak (1+) for HER4 in oral melanoma. Bar: 50 μm. Red arrows: immunostaining. Yellow arrows: Melanin
