Hydrogen peroxide treatment assay Cells were plated at a density of 10,000 cells/well in 96-well plates and incubated at 33°C overnight. The following day, fresh media containing varying concentrations of hydrogen peroxide was dispersed to each well. Cells were incubated in the presence of hydrogen peroxide for 24 hours, at 33°C, and viability was measured using the CellTiter-96® AQueous Non-Radioactive Cell Proliferation Assay (Promega), according to the manufacturer's specifications.