LCT and neoplasm: Figure 4 displays a bar graph summary (mean, standard deviation) of Glc concentration (far right panel, b) and concentration ratios (Glx/Lac, Glx/Glc, and Lac/Glc; left panels, a) for GL261 tumor implanted in non-irradiated brain (n = 13, red) and GL261 tumor in brain irradiated (30 Gy) 6 weeks prior to tumor implantation (n = 7, blue).