PTK2B and glioblastoma: Since FAK also displays elevated expression in neuronal cells [41], we generated stable U-118 MG human glioblastoma cells that inducibly express GFP fused LD2-LD4 (hereunto referred to as ‘U-118 MG-LD2-LD4’) to examine the effects of LD2-LD4 expression on both endogenous FAK and PYK2 (Additional file 1: Fig. S2A).