Fine-tuning of Notch signaling sets the boundary of the organ of Corti and establishes sensory cell fates. - Basch ML; Brown RM 2nd; Jen HI; Semerci F; Depreux F; Edlund RK; Zhang H; Norton CR; Gridley T; Cole SE; Doetzlhofer A; Maletic-Savatic M; et al. (ELife, 2016)