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Histological images (hematoxylin and eosin staining) at eight weeks after operation. (a) unfilled defect in the control group (bar = 1 mm). (b) AL (bar = 1 mm), (c) AL/HA (bar = 1 mm), (d) and AL/HA/SF (bar = 1 mm) composites. (e–h) are magnified views of the boxed areas in (a–d) (original magnification 100×, bar = 100 µm).
