C9orf72 and glioblastoma: C9ORF72 is observed in a variety of human cell lines including U2OS (osteosarcoma), HeLa (cervical cancer), RKO (colon carcinoma), U87 and U251 (glioblastomas), motor neuron precursor cells (NPCs) and motor neurons (MNs) derived from human-induced pluripotent stem cells (Figure 4—figure supplement 3A).