RAB13 and glioblastoma: Using RT-PCR, we confirmed that among the microvesicular transcripts shared by SW480 and glioblastoma microvesicles [15] but not detected in mast cell microvesicles, RAB13, CXCR4, MYC, and FAS transcripts were present in the SW480-derived microvesicles (Figure 3B).