Fig.8. Formation of a bone-biositall (M-31) block: A, B - granulaton tissue, growing into pores of biositall M-31 (staining with hematoxylin and eosin; an arrow indicates a graft fragment); C - fibrous tissue (f) with newly-formed bone trabeculae (t) and calcification areas on a borderline of sitall (s) and a bone (b). Native microsection in slanting incident light.