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(a) The preparation of hydrogel precursor solution (HG3) and the solution at low temperature of 4 °C and the formed hydrogel at 37 °C, (b–d) the HG3 precursor solution can be readily ejected to form droplets using a syringe, adopted from [33] with permission from Elsevier through copyright clearance center. CS: Chitosan; HA: Hyaluronic acid; GP: Glycerophosphate.
