UROD and cyst: By contrast, knockdown of lid using the early cyst cell driver c587-Gal4 (Manseau et al., 1997) (Fig. 1H and Fig. S2A-B) or the hub driver upd-Gal4 (Boyle et al., 2007) (Fig. 1H and Fig. S2C-D) did not lead to a change in GSC number.