GABRB1 and supranuclear palsy, progressive, 1: We also found that GABRB1 and GABRB2 were significantly lower in the temporal cortex of PSP brains and that GABRA2, GABRA4, GABRA5, and GABRB1 were significantly lower in the cerebellum of PSP brains compared with pathology-free controls (Fig. 6f).