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Fig. 2 Zebrafish hair cells labeled with the fluorescent dye YO-PRO-1, which binds DNA and labels hair cell nuclei. (A) An undamaged neuromast labeled with YO-PRO-1. Approximately 15 hair cells are visible and healthy in appearance. (B) After a 1-h exposure to the ototoxic drug neomycin at a concentration of 200 μM, most of the hair cells have died. Scale bar in (B)= 10 μm and applies to both panels.