Biochemical assays of the constructs 2 weeks post-implantation. A) Noggin expression p < 0.05 compared to ***G1 and G4; B) Runx2 expression, p < 0.05 compared to * G4, ** G1; C) ALP activity normalized to DNA content, p < 0.05 compared to *G1, **G2,3,5, ***G3; and D) Calcium normalized to DNA content, p < 0.05 compared to *G1, ΦG2.