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SEM images of SSS scaffold surface subjected to acellular in vitro bioactivity study at various periods (0 d day 0, 1 d after 1 day, 3D after 3 days; 7 d after 7 days; SEM magnification: a 0 day (×5,000), b 1 day (×20,000), c 3 days (×25,000), d 7 days (×25,000))
