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Characterization of the electrophysiological properties and compatibility of the graphene-based material. (A) Spontaneous beating rates of cardiomyocytes seeded on GelMA incorporated with different amounts of rGO (0, 1, 3, 5 mg/ml) plotted against incubation time. (B) Stability of cells (in terms of DNA content) cultured on GelMA alone and on rGO-GelMA hydrogels. Phase contrast images of cells cultured on (C) GelMA and (D) rGO-GelMA hydrogels at 6 days after seeding.
