Fig. 2From: Pathological characteristics and genetic features of melanin-producing medullary thyroid carcinoma10.1186/s13000-018-0764-2The immunophenotype of melanin-producing MTC. The tumor cells were positive for S-100 protein (2a), melan A (2b), HMB-45 (2c), syn (2d), calcitonin (2e) and TTF-1 (2f). (Magnification × 20)Back to article page