Figure 2. Cell viability in function of increased TNF-α concentration. Both viable and dead cells were counted using a hemocytometer. A percent of viable cells to the total cells was then calculated for each culture flask. Error bars represent standard deviations obtained from triplicate experiment for each dose of TNF-α used. To assess the number of cell death in the control group we have chosen not to normalize the values to 0 ng/ml of TNF-α.