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S100A13 staining in nevus-associated melanoma: (a) at low power magnification, nevus-associated melanoma shows cytologically bland melanocytes (left side) in contiguity with larger, pleomorphic atypical melanoma cells (right side); (b) higher magnification of the nevus component shows S100A13-negative melanocytes with an internal positive control (S100A13-positive nerve, asterisk); (c) higher magnification shows moderate S100A13 staining in the cytoplasm of melanoma cells.
