Fig. 2
From: Stromal-epithelial responses to fractionated radiotherapy in a breast cancer microenvironment
MCF-7 metabolic activity. The MTT assay for MCF-7 cells under irradiated and non-irradiated conditions for 2D monoculture. The two data sets were fit to a straight line using linear regression. Slopes indicate changes in the metabolism of cells in the sample over time. A positive slope occurs during cell proliferation and a negative slope occurs as the cancer cells respond to daily doses of radiation. Error bars indicate one standard error of the mean (SEM)