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Effect of topical application of β-NGF on angiogenesis in collagen bone substitute-filled defects.
(A) Blood vessels in the bone defect during repair (hematoxylin-eosin staining, × 400). (B) Number of blood vessels at the bone defect site increased on both sides until days 7–14, and diminished thereafter. All data are expressed as the mean ± SD (n = 6). β-NGF: β-Nerve growth factor; d: days.
