OLIG2 and neoplasm: While PDGFRa and TGFβ mRNAs were lower in recruited olig2 cells than tumor cells, mRNAs coding for EGFR, TGFα, TNF, LIF and FGFR1/2 were higher in recruited cells; prominin1 (CD133) mRNA was 5.3 fold higher in the recruited than tumor olig2 cells.