Figure 7.
Frequency dependence of four systems: (A) System 1: chitosan/collagen hydrogel alone; (B) System 2: hydrogel with 5% nHA; (C) System 3: hydrogel with 2% nHA and 5% CaCO3; and (D) System 4: the hydrogel with 5% nHA and 1% CaCO3.
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