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Schematic presentation of scaffolds magnetization process: (1) scaffold is immersed in 1 mL of ferrofluid for 15 min; (2) scaffold is freeze-dried for 24 h; (3) scaffold is rinsed with deionized water under ultrasonication for 20 min; (4) scaffold is freeze-dried for 24 h; and (5) magnetized scaffold is obtained.
