Figure 5: Histological and immunohistochemical staining of control specimens after two (a-c), four (d-f) and eight days (g-i): The EvG stain revealed minimal fibrosis after two days (a, x100). Inflammation was moderate in the ASD stain, which revealed pink coloured granulocytes (b, x400). In addition, a moderate infiltration of brown-stained CD68-positive macrophages was detected (c, x400). Four days postoperatively, fibrosis was still minimal in the control (d, x100 EvG). The inflammatory response remained moderate (e, ASD, x400) and a mild macrophage infiltration could be seen (f, anti-CD68 stain, x400). Eight days postoperatively, a narrow fibrosis band was visible in the EvG stain (g, x200) and the ASD stain revealed a moderate inflammatory reaction (h, x400). A mild infiltration of macrophages was seen via immunohistochemistry (i, anti-CD68 stain, x400).