Purity ~85% (SDS-PAGE). GFAP, a class-III intermediate filament, is a cell-specific marker that, during the development of the central nervous system, distinguishes astrocytes from other glial cells. Source: Recombinant protein corresponding to aa1-430 from mouse Gfap, fused to His-SUMO-Tag at N-terminal, expressed in E. coli. Molecular Weight: ~65.9kD AA