Fig. 2

Injectable gelatin hydrogel containing growth factor. The growth factor solution is impregnated in gelatin hydrogel to create a gel-form that can be percutaneously injected using a syringe. a Preparation of the growth factor solution (upper) and the freeze-dried gelatin (lower). b A gel-form of growth factor-impregnated gelatin hydrogel inside the syringe. c Injected gel-form containing growth factor