Fig. 5.

The immune response of macrophages on various samples in vivo. Images of hematoxylin-eosin (HE) staining and Masson's trichrome staining of air-pouch tissues adjacent to different samples at 1 and 4 d after implantation. Images of HE staining of tissues showing the entire structure and layers of the air-pouch tissues and images of Masson's trichrome-stained tissues displaying the fibrous tissues and the infiltrating cells on day 1 and 4. The corresponding thickness of the fibrous layers and the number of infiltrated cells on day 1 and 4.