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The expression level of the EGFR family in different grades of glioma tissues. a, b, e and f The mRNA expression levels of EGFR and ERBB2 were significantly increased in GBM. c, d, g, and h The mRNA expression levels of ERBB3 and ERBB4 were significantly increased in glioma (WHO II). * represents p < 0.05, ** represents p < 0.01, *** represents p < 0.001, and **** represents p < 0.0001
