PTK2 and Huntington disease: Results showed that both FAK- (Fig. 1E) and Src- (Fig. 1G) positively stained fibroblast percentages remained the same (~30%) between ND and HD, while p-FAK-Tyr407- (Fig. 1D) and p-Src-Tyr529- (Fig. 1G) positively stained fibroblast rates in HD were remarkably up-regulated to ~30% vs. ~10% in ND or down-regulated to ~20% vs. ~40% in ND, respectively.