Figure 4From: Eggshells as natural calcium carbonate source in combination with hyaluronan as beneficial additives for bone graft materials, an in vitro studyImmunohistochemistry staining with type I collagen on polystyrene. a) control culture, cell cultures treated with b) eggshell powder (ES), c) calcium carbonate (CC), d) hyaluronan (HA), e) hyaluronan + eggshell powder (HAES) as cell culture medium supplement.Back to article page