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C9–PNA reduces the colony survival of U87MG glioblastoma cells. Colony formation assay of cells treated with 1.0 μM of either dK4–PNA and C9–PNA or scrambled controls (dK4–PNA-Scr and C9–PNA-Scr). After 2 weeks, the plates were fixed and stained, and the colonies were counted (in triplicates). *P value < 0.05.
