Fig. 3
HE stained healing calluses. Fracture end surrounded by a spindle red-stained callus with calcification started from the four angles formed by periosteum and cortex (a). Smaller size of calluses was found in diabetic animals at the end of the second and fourth week after fracture (e, f) than that of the normal group (b, c). At the end of the eighth week, calluses from the normal group had finished reconstruction (d) while calluses from the diabetic group had not (g)