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Res release from various n-HA/Res/CS composite microspheres in PBS solution (pH = 7.4) at 37 °C: (a) Cumulative concentration of released Res; (b) Percentage of released Res relative to total Res loaded into microspheres; (c) The pH of media; (d) The swelling property of microspheres incubated for 2 days. Error bars represent standard deviation from the mean (n = 5) (**p < 0.01; *p < 0.05).
