Primary motor neuron developmental defects in the Sox2 morphants. (A) Confocal imaging analysis of primary motor neurons in wild type and Sox2 morphants at 24, 48, and 72 hpf. Scale bar = 50 μm. (B) Quantification of zebrafish embryos with abnormal PMNs (n = 176 and 238, respectively). (C) The length of CaP axons in control and Sox2 morphants at 48 hpf (n = 21 and 32, respectively) and 72 hpf (n = 17 and 19, respectively). (D) The number of branches per 1-mm CaP axon in control and Sox2 morphants at 48 (n = 8 and 7, respectively) and 72 (n = 5 and 6, respectively) hpf. Each bar represents the mean ± SD. Values with ** and *** above the bars are significantly different (P < 0.01 and P < 0.001, respectively).
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