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FT-IR spectrum taken in the ATR mode for the characterization of signature peaks from (1) PEI film (2) arginine-coated PEI film, and (3) fibronectin-coated PEI film. (a) Broad peak at 1550–1600 cm–1 corresponds to protonated, hydrated guanidium groups. (b) Amide I (from fibronectin) 1670 cm–1 and (c) amide II 1560 cm–1.
