Double-label fluorescent localization of neuregulin with GFAP, ErbB2 with GFAP, and ErbB3 with ErbB2 in an injured cortex. A, Neuregulin immunoreactivity near the injured site. B, GFAP immunoreactivity in the same section of A. C, Superimposed image ofA and B. D, ErbB2 immunoreactivity near the injured site. E, GFAP immunoreactivity in the same section of D.F, Superimposed image of D andE. G, ErbB3 immunoreactivity near the injured site. H, ErbB2 immunoreactivity in the same section of G. I, Superimposed image ofG and H. Scale bars, 10 μm.