Figure 4.

a) The addition of different concentrations of hydrogen peroxide (H₂O₂) to PHTB(TA‐siRNA) hydrogels and b) mechanism for the response of the hydrogels to ROS. c) The SEM images of the freeze‐dried hydrogels after the addition of the different concentrations of H₂O₂. d) The rates of the release of siRNA from the hydrogels after the addition of the different concentrations of H₂O₂ to the hydrogels (n = 3). e) The agarose gel electrophoresis analysis of the siRNA released from the hydrogels after the addition of the different concentrations of H₂O₂.