Figure 1: In silico analysis of EGFR, ERBB2, ERBB3 and ERBB4 mRNA expression using R2 analysis software on datasets of non-malignant brain tissues of cerebral cortex (white, n=44) versus datasets of adult (dark grey, n=153) and pediatric HGG (grey, n=53). Y-axis shows expression in arbitrary units. Boxplots represent 25%, 50% (median), and 75% values, with error bars indicating maximum and minimum values for each category. Statistical outliers are indicated by small circles.