V-ATPase loss reduces the number of hair cells in neuromasts. (A) Acetylated tubulin staining detects hair cells in wild-type, atp6v1f−/− and atp6v1h−/− neuromasts at 2 dpf and 4 dpf. Arrowheads point to individual hair cells. (B,C) The number of hair cells per neuromast at 2 dpf and 4 dpf in atp6v1f−/− embryos and wild-type siblings (B), and atp6v1h−/− and wild-type siblings (C). (D) Sox2 staining labels neuromast support cells at 2 dpf and 4 dpf. Dashed line circles indicate the neuromast boundary. (E,F) The number of support cells per neuromast at 2 dpf and 4 dpf in atp6v1f−/− embryos and wild-type siblings (E), and atp6v1h−/− and wild-type siblings (F). n=number of embryos. ***P=0.0009 and ****P<0.0001 by unpaired Student's t-test with Welch's correction. ns, not significant.
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