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In vitro osteoclast activity of different core-shell nanofibers. (a–b) Representative TRAP staining images and enzyme activity of TRAP from RAW264.7 cells cultured on different core-shell nanofiber; (c–e) Gene expression of osteoclastogenesis-related markers, including TRAP, CTSK, and RANK in RAW264.7 cells after 4 days.
