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Comparative analysis of cathepsin B (CTSB) and inducible nitric oxide (NO) synthase (iNOS) expression in non-H-1 parvovirus (H-1PV)-treated primary tumor and in the second tumor recurrence (two months after H-1PV treatment of the first recurrence). CTSB, red; iNOS, red; DAPI, blue. Scale bars: 50 μm.
