The immune system of embryonic tissues is not fully developed and responds slowly to external stimuli. If embryonic tissues are injected into a traumatized adult, it can effectively prevent the formation of wound scars. A growth factor in adult platelets can accelerate wounds Healing, the development of a drug that inhibits this growth factor, the drug is applied to the wound site within 12 hours of the wound, and there is no scar after the wound heals. Regarding the above two medical measures, what is the most accurate? ['Its common effect is to make the wound respond slowly to external stimuli.', 'Its common effect is to change the state of natural healing of the wound.', 'Its common effect is to significantly reduce the blood clotting speed at the wound.', 'Its common effect is to make the wound healing process relatively slow.']