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Microscopic features of primary skin tumors during the experiment, H&E staining. (A) Nodular tumor occupying the entire dermis, extending to the subcutis, but with grenz zone to the epidermis (original magnification, ×40). (B) Tumor cells invading striated muscle cells (original magnification, ×400). (C) Achromic epithelioid malignant melanocytes with vesiculous nuclei and eosinophilic macronucleoli (original magnification, ×400). (D) Area of necrosis (original magnification, ×40).
