Serine protease inhibitor. Expressed by the venom gland. Belongs to the venom Kunitz-type family. It is unsure if the sequence starts at position 1 or 2. Two N-terminal sequences could be detected after automatic Edman degradation, one is the sequence AHKPRFYYNP, that corresponds to the fragment 18-27, and the other is DH., that possibly corresponds to the fragment 2-17. Vur-KIn possibly was partially degraded into two fragments which might be kept linked by disulfide bonds during sample preparation.