Fig. 2
δ15N measurements of the mouse brain tumor model. a-c Brain tumor biopsies from April 2019, with 2 replicates of each tissue type (tumor, tumor bed, healthy tissue) per mouse and 3 mice measured; d Brain tumors from October 2019, with 2 replicates of each tissue type per mouse and 1 mouse measured; e-g Brain tumors from November 2019 with 1 sample of each tissue type per mouse and 3 mice measured. Error bars indicate standard deviations of replicates where replicates were measured