Fig. 2
From: Maturation toward neuronal tissue in a Ewing sarcoma of bone after chemotherapy
Immunohistochemistry on resection specimen (40x) (a) HE showing a part of the tumor with both differentiated (neuronal and ganglion-like cell) and small groups of primitive (typical Ewing) tumor cells (b) NF Highlights part of the differentiated tumor cells and the neuropil. The primitive tumor cells are mainly negative (c) CD99 labels the primitive tumor cells, whereas the differentiated component is negative. d Neu-N shows strong reactivity of the differentiated tumor cells and is negative in the primitive tumor cells