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Microscopic images of BAECs cultured on 2D hydrogel surfaces for 1, 7, and 14 days: (a–c) pSBMA hydrogel as negative control groups; (d–f) RGD-grafted pSBMA hydrogel; (g–i) QK-grafted pSBMA hydrogel; (j–l) RGD- and QK-grafted pSBMA hydrogel; (m–o) TCPS as positive control groups. BAECs, bovine aortic endothelial cells.
