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USP4 is highly expressed in glioblastoma. (A) Reverse transcription-quantitative polymerase chain reaction and (B) western blotting of USP4 expression levels in normal brain astrocytes (control), U251 cells and U87 cells. (C) Immunohistochemical staining for USP4 in normal brain tissue and brain carcinoma (magnification, ×200). *P<0.05 vs. control cells. USP4, ubiquitin-specific protease 4.
