The BMP-2-loaded scaffolds were immersed in Dulbecco’s modified Eagle’s medium (DMEM) for this test. The DMEM was changed at specific time points and assessed for levels of BMP-2 using an enzyme-linked immunosorbent assay kit (Thermo Fisher Scientific, Carlsbad, CA, USA) and a spectrophotometer (TECAN Infinite Pro M200, Männedorf, Switzerland). All experiments were performed in triplicate, with the averages recorded.
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