CDKN2A and malignant glioma: Since F11r and Sell are expressed in <2% of the total cells isolated from bone marrow and brain, respectively, we first sought to determine whether F11r and Sell would retain their distinctive expression between infiltrative BMDM and resident microglia populations in the setting of induced murine malignant glioma using Ntv-a Ink4a-Arf-/-;Gli-luc mice injected with RCAS-PDGFB (Figure 3A) [11].