ARL13B and glioma: However, using biopsy material, recently derived low-grade (S7) and high-grade (L0, R24-03, and R24-06) human glioma cell lines, and high-grade mouse glioma cells (KR158) [39], we, and others, find that ARL13B+ cilia are readily identifiable [18,20,25,49] (Supplementary Figure S1E–I).