In this context, Song et al.65 demonstrated that the incorporation of 0.1 wt% of GO on PCL/GO nanofibers, increased 1.7-fold the expression of Gfap in neuron-like rat pheochromocytoma cells (PC12 line) while neural stem cells (NSCs) favorably differentiated into astrocytes on rGO microfibers or graphene foams, enhancing the expression of Gfap by 1.43-fold and 2.5-fold, respectively66,67. Here, GFAP is linked to hereditary pheochromocytoma-paraganglioma.