CXCL12 and glioblastoma: Adding CXCL12 (6 nM, 52.2 ng/mL) led to a significant increase in calcium concentration that was ~ 2.3-fold higher in F98 cells compared with U98 GBM cells (average FU measured as a function of time for F98 cells is 1397 and for U87 cells is 616).