(a) Scheme of the injection of NCs and the wound healing process. (b) Photographs of wounds taken after 0, 1, 3, 6, 9 days of the injection (0.1 mL 100 μM NCs or the control). (c) The corresponding recovery ratio is defined by closure area/initial area wound*100% as a function of time (Some hairs around the wounds were cut for clear observance) in conditions: A, control; B, GSH-AgNCs; C, GSH-AuNCs; D, DHLA-AgNCs; E, DHLA-AuNCs. Data from all four experiments are presented as mean ± SD. Scale bars: 5 mm.