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Identification of new differentially expressed genes in glioma tissues according to the bioinformatic analysis. (A) Volcano plot indicating changed genes in grade 2 glioma compared to grade 3 glioma. Red and blue dots indicate grade 3 glioma genes, respectively (p < 0.05, fold change > 2). (B) Volcano plot showing genetic changes in grade 2 gliomas, but not in grade 4 gliomas. Red and blue dots represent four-level glioma genes, respectively (p < 0.05, fold change > 2).
