FCM analysis of 3 GBM xenografts using antibodies against a panel of glial markers confirmed that 96% of these cells expressed GFAP and 90% expressed MBP consistent with co-expression of several glial markers, whereas Nestin and O4 were expressed at somewhat lower rates (Additional file 1: Figure S1f). The gene discussed is IGKV1D-37; the disease is glioblastoma.