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Methylation of immune checkpoint genes PD-L1 (A), PD-L2 (B), PD-1 (C), and CTLA4 (D) in diffuse lower-grade glioma patients (n = 419) with respect to methylation subtypes (LGm1, LGm2, LGm3). Bars indicate median. p-Values refer to ANOVA with Bonferroni Post hoc test.
