A, Hair cell death in Tg(pou4f3:gap43-GFP) fish is similar to that of *AB wild-type fish. Five dpf zebrafish larvae were treated with 0, 100, 200, or 400 μm neomycin for 1 h. Graph displays the mean total number of parvalbumin-labeled hair cells in seven neuromasts from each fish (n = 10 fish/group). B, Hair cell regeneration in Tg(pou4f3:gap43-GFP) fish is similar to that of *AB wild-type fish. Five dpf zebrafish larvae were treated with 400 μm neomycin for 1 h and then held in EM for 1, 24, 48, or 72 h. Graph displays the mean total number of parvalbumin-labeled hair cells in seven neuromasts of 10 fish for each group. Error bars indicate ±1 SD.