{"type":"root","children":[{"type":"paragraph","children":[{"type":"text","value":"Glial fibrillary acidic protein or GFAP is a Type III protein of the intermediate filaments principally found in astrocytes in the central nervous system, but can also be found in neurons, hepatic stellate cells, kidney mesangial cells, pancreatic stellate cells, and Leydig cells. It has a role in the cytoskeleton of the astrocyte and possibly many other stellate-shaped cells. GFAP is also expressed in brain tumors derived from astrocytic origin."}]}]}