Schwannoma tumorlets in the DRGs of mGFAP-Cre;Smarcb1flox/flox;Nf2flox/flox mice were negative for SMARCB1 and merlin staining, about 60% were positive for S100 protein staining, and all were positive for GFAP and FABP7 (Fig. 6). This evidence concerns the gene GFAP and schwannoma.