560142.fig.001a
(a)
560142.fig.001b
(b)
Figure 1: (a) In vitro luciferase expression of the COPROG + luciferase versus naked-luciferase DNA group. (b) In vitro BMP-2 expression of the COPROG + BMP-2 plasmid versus the control group (copolymer without plasmid).