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Tumour regrowth and pHe in irradiated mice. The mean tumour volume before irradiation was approximately equal to the non-irradiated group at Day 9 in Fig. 4. Each data point represents the mean of 6 mice with standard error of the mean displayed. Significant difference in pHe and tumour volume between Day 0 (measured before irradiation) and Day N is shown * (p < 0.05).
