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Release of IL-4 and VEGF from gelatin/HA-tyr films. (A, B) Schematic representation of different loading ways of growth factors inside gelatin/HA-tyr cross-linked films. Release profile determined by the ELISA test over 144 h for VEGF (C, D) and IL-4 (E, F) at 37 °C in PBS. For C–F, fresh supernatant was added after each record and three samples for each condition were used.
