(A) Expression of Cardiac Troponin I (cTnI) in UCMSCs on the TCPs, GelMA-O5, GelMA-O5/rGO hydrogel. (B) Expression of Connexin-43 (Cx43) in UCMSCs on the TCPs, GelMA-O5, GelMA-O5/rGO hydrogel. (C) Expression of cTnI and Cx43 in UCMSCs analyzed by western blotting. (D) RT-PCR quantitative analysis of cTnI and Cx43 in UCMSCs from three independent experiments for each group. (*) P < 0.05, (**) P < 0.01 and (***) P < 0.001.