c, Electron microscopy (EM) of Seckel and WT fibroblasts. In contrast to WT, Seckel basal body has disorganized microtubule of doublet and triplets (red arrows and red circles in schematics).d, Longitudinal serial-sectioning EM of WT (top) Seckel fibroblasts (bottom). In contrast to WT basal bodies that have structurally normal distal and sub-distal appendages (yellow arrows and red triangles of DA and SDA in schematics), Seckel basal body displays either lack or misplaced appendages. n> 15 basal bodies.e, Seckel cells show reduced EdU incorporation after 72 hrs. Error bars are s. e. m. ** p<0.01, ttest; n = 4 independent experiments, 727 cells for WT and 844 cells for Seckel. 