Fig. 1

ARL13B⁺ primary cilia are present in GBM biopsies. a–d Representative confocal images of tumor biopsies from patients of the indicated age and sex. Biopsy sections were immunostained for acetylated alpha-tubulin (aaTub; first column, red), a marker of the ciliary axoneme, and ARL13B (second column, green), and co-labeled with nuclear marker DAPI (third column, blue). Arrowheads point to double-labeled cilia in each tumor section. Scale bar in a = 10 μm