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HE staining of the callus in the saline-treated (a) and Sal B-treated (b) groups at week 8 post-fracture. (a) Spongiosa(arrow) was seen at week 8 post-fracture in the saline-treated group (HE × 100). (b) More trabeculae(arrow) were observed and the spongiosa was more compact in the Sal B-treated group at week 8 post-fracture (HE × 100).
