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A–E Examples of hair cell damage along with the grading system used for the initial screen. Each panel shows a single neuromast stained with YO-PRO1. Neuromasts range from undamaged control (A, grade 0), to subtle disorganization of hair cells and nuclear condensation (B, grade 1), to near complete hair cell loss (E, grade 4). Scale bar in E = 10 μm and applies to all five panels.
