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FTIR spectra of (i) Nano-P(3HB-co-4HB), (ii) RGD peptides, (iii) NH2-nano-P(3HB-co-4HB), and (iv) Nano-P(3HB-co-4HB)-RGD. In the FTIR spectra, A indicates CH3 and CH2 stretching, B indicates C=O stretching, C indicates N–H stretching (broad band), D indicates amide I, E indicates amide II and F indicates N–H stretching (small and strong intensity band).
