Toxin with inhibitory activity on serine proteases, but not on potassium channels (PubMed:24418069). The recombinant toxin is active against trypsin (Ki=9.61 nM), kallikrein (Ki=24.8 nM), and chymotrypsin (PubMed:24418069). Expressed by the venom gland. The recombinant toxin does not show activity on Kv1.1/KCNA1, Kv1.2/KCNA2, Kv1.3/KCNA3, Kv2.1/KCNB1 and Kv4.3/KCND3 channels, as well as on calcium (Cav) and sodium channels (Nav). It also does not show detectable activity on thrombin. Belongs to the venom Kunitz-type family. 03 (sub-Kunitz) subfamily.