DaE1 and DaE2 are serine protease inhibitors that inhibit voltage-gated potassium channels Kv1.1/KCNA1 channels (IC(50)=300 nM). Expressed by the venom gland. Neither DaE1 nor DaE2 affect Kir2.1/KCNJ2 channels. Belongs to the venom Kunitz-type family.