(a) Fluorescence microscope images of labeled CS-(HA-LDc)1 coating and CS-(HA-LDc)7 coating on titanium surface under ×100 magnification. (b) Influence of layer number on the amount of loaded plasmids. n = 3 for each group. Data are displayed as mean ± SD. (c) DNA remained on porous CS-(HA-LDc)n titanium surface after incubated in PBS buffer for different degradation time. Data shown were obtained from a single experiment (n = 3 for each group), which was performed three times. Data are displayed as mean ± SD.