ARL13B and neoplasm: Sections of the cores of each tumor were immunostained for Arl13b, a GTPase that is enriched in the axonemes of most primary cilia [36–38], and gamma (G)-tubulin, a protein that is abundant in basal bodies, to verify that the mCherry-positive L0, S2 and S3 control cells remained ciliated and that the mCherry-positive L0, S2, and S3 cells expressing dnKif3a were not.