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SEM images of HAc-Alg/30 wt% CaP composite hydrogel scaffolds after 2 weeks of degradation. The degraded specimens were fully dehydrated using critical point dryer and coated with gold. The surface of HAc-Alg/30 wt% CaP clearly exhibits needle-like nanocrystals, which is well-known to be the morphology of apatite.
