Figure 7. THC and RES do not extend the life span of Sir2 mutants. Effects of THC or RES (50 μM) on the life span of Sir2-/df mutant Drosophila under natural conditions. Life span studies were carried out at 25°C with a total of around 80 newly eclosed male (M) flies (yw background). The statistical analysis of the data is summarized in Table