Figure 2From: Earthworm (Pheretima aspergillum) extract stimulates osteoblast activity and inhibits osteoclast differentiation The morphology and proliferation of osteoblasts treated with various concentrations of earthworm extract. MG-63 cells were treated with PBS as a control or different concentrations of earthworm extract. After 2 day of culture, the cell layers were stained with Liu’s stain solution and observed using an inverted optical microscope. Arrows point to osteoblasts.Back to article page