A Representative overview images and quantification of the β-Galactosidase reporter signal in the DG of 8-week old, 24-week old and 36-week old BATGAL mice. Note the decrease in reporter signal with increasing age (n= 4 animals per age, 200-300 cells per animal) [8 weeks vs 24 weeks p=0.0268, 8 weeks vs 36 weeks p=0.0268]. Scale bar= 100µm. 