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FTIR spectra for (A) CO, (B) CS, (C) cross-linked CO with EDC, and (D) CO–CS cross-linked with EDC.
Abbreviations: FTIR, Fourier-transform infrared spectroscopy; CO, collagen; CS, chondroitin sulfate; EDC, 1-ethyl-3-(3-dimethyl-aminopropyl)-1-carbodiimide hydrochloride.
