The use of a β‐gal reporter under the control of an NF2 promoter in transgenic mice identified intense β‐gal staining in forebrain and telencephalon extending caudally in the later covered by pia mater, consistent with meningeal layers derived from the neural crest and the most common locations for the development of NF2-mutated meningioma [74]. The gene discussed is NF2; the disease is meningioma.