Multiple embryonic origins give rise to forebrain oligodendrocytes (OLs). yet controversies and uncertainty exist regarding their differential contributions. We established intersectional and subtractional strategies to genetically fate map OLs produced by medial ganglionic eminence/preoptic area (MGE/POA). lateral/caudal ganglionic eminences (LGE/CGE). https://www.roneverhart.com/10mm-Male-GRAV-Angled-Quartz-Banger-45/