GFAP and Huntington disease: Hence, the main astrocytic processes and the perivascular limiting membrane are the most prominent GFAP+ structures in striatal parenchyma, not only in brains of tgHD rats surviving for 12−24 months (Figures 9(b) and 9(c)), but also in old wt rats, as well as in postmortem specimens of HD patients (Figures 10(b) and 10(c)).