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characterization of PD-L1 expressions in gliomas. Gliomas grade III (Anaplastic Astrocytoma/AA panels A to D) and grade IV (Glioblastoma Multiforme/GBM panels E to H); hematoxylin eosin images of AA (panels A and C) and GBM (panels E and G); representatives immunohistochemistry of PD-L1 negative AA (panel B) and GBM (panel F) and PD-L1 positive AA (panel D) and GBM (panel H)
