f, Seckel cells show delayed mitotic entry. Note that an unresorbed Arl13b-positive ciliary remnant (ciliary membrane, green) is present with one of the centrosomes(Paridaen et al, 2013). Bar diagram shows mitotic index of WT and Seckel cells 24 hrs after serum stimulation. n = 3 independent experiments, n> 300 cells for WT and Seckel. Error bars are s.e.m. Scale bar 1 μm. 