Fig. 4. Bioactivity of the constructs. (A–D) FE-SEM micrographs ((A, C) gelatin-PEDOT:PSS and (B, D) PDA-coated gelatin-PEDOT:PSS scaffolds), (E) FTIR spectra and (F) XRD patterns of mineralized HA-like layer on the surface of PDA modified and unmodified scaffolds after 4 weeks of immersion in SBF solution. (G) Representation of bioactivity mechanism.