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(a) In this case of rhabdomyosarcoma, differentiation toward skeletal muscle is visible in a part of the tumor. There is also a great variety of tumor cell shapes. Hematoxylin and eosin staining, primary objective magnification 20×. (b and C) Muscle differentiation was confirmed by immunohistochemistry tests for the presence of desmin (micrograph b) and the Myf4 marker (micrograph c). In both micrographs, primary objective magnification 20×.
