Figure 3. Frontal sections (7 µm thick) of the periodontium around the incisors stained with TRAP. Many osteoclasts and resorption lacunae were detected in the rhVEGF injection group, especially on day 14 (A,B). In contrast, a small number of osteoclasts appeared in controls (C). Arrows indicate osteoclasts. PMB, premaxillary bone; DR, distal side of the root.