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Immunohistochemical staining of C5 and C5aR1 on ESFT tissue microarray. (a) Negative staining of C5 in Ewing sarcoma cells; (b) Negative staining of C5aR1 in Ewing sarcoma cells; (c) Positive cytoplasmic staining of C5 in Ewing sarcoma cells; (d) Positive cytoplasmic and membrane staining of C5aR1 in Ewing sarcoma cells and weak positivity in matrix including fibroblasts. Original magnification ×400.
