b, Seckel cells display overly long cilia. Arl13b labels cilium. Scale bar 1 μm. Quantification of cilia length, *** p<0.001; t-test; Scatter plot showing mean with ±SD (iii). Cells displaying normal (0-5 μm), long (5-10 μm) and extra long (>10 μm) cilia. *** p<0.001; Ordinary Two-way ANOVA (iv). Average cilia length of WT and Seckel cells (v). n = 3 independent experiments, 228 cells for WT and 297 cells for Seckel. Error bars are s. e. m. *** p<0.001, t-test. 