Moreover, we observed that T1D progression may be inhibited if the average lifespan of cytotoxic CD8+ T cells in islets is reduced to five days or less, or the number of apoptotic β cells is less than a certain threshold estimated at most 510 damaged beta cells exist when the simulation begins (the range for the initial number of damaged cells has been scaled up to reflect the actual size of β cells). This evidence concerns the gene CD8A and type 1 diabetes mellitus.