The CS-PG brevican and versican are not detected in the glial scar 30 d after injury. A, GFAP immunoreactivity is evident around the implanted filter and especially on astrocytic processes that extend into the implant. In contrast, immunohistochemistry for brevican (B) and versican (C) was negative at this same time point on sections from injured cortex containing filter implants (i). Scale bars: A, 100 μm;B, C, 50 μm.