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Expression of the immune checkpoint genes in different glioma grades. Expression of (a) CD274, (b) CTLA4, (c) HAVCR2, (d) LAG3, (e) TIGIT, (f) PDCD1, (g) PDCD1LG2, and (h) SIGLEC15 in gliomas according to WHO grade status in the CGGA databases.
