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Immunohistochemical staining for vascular endothelial growth factor in the areas adjacent to the implants in the surgical sites. Observe the staining of fibroblasts, which are present in a noticeably smaller number in the group that received BPUIs (right) than in the group that received PUIs (left) (original magnification 400X). Color images available online at www.liebertpub.com/jop
