Anticoagulant protein that may inhibit serine proteases. The anticoagulant effect of this recombinant protein on blood clotting is found both in the recalcification time (RT) and the activated partial thromboplastin time (APTT) tests, indicating it acts in the common pathway of blood coagulation. Expressed in salivary glands. By blood feeding. The tick attachment time is prolonged and the engorgement body weight is decreased after gene silencing by RNA interference. No significant difference is observed in the feeding period and survival. May be studied for future application as a vaccine, since it impairs tick attachment time and engorgement body weight.