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. 2014 Feb 3;16(1):1–10.

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Fig 4 — A. Fourier transform infrared spectroscopy (FTIR) of Phe and 4-Iodo-Phe standards. Arrows show the characteristic peaks assigned to C-I bond stretching. B. FTIR spectroscopy of PCL/Gel and RGD modified PCL/Gel. The assigned peaks are close to 800 cm^-1 on the RGD modified PCL/Gel scaffold spectrum.