Potent toxin and weak serine protease inhibitor that displays activity on both trypsin and elastase (PubMed:29285938). May act as a neurotoxin by blocking voltage-gated potassium channels (Kv1.1/KCNA1 and Kv1.2/KCNA2) (Probable). Has a neuroprotective effect, since it suppress, at low concentration, the 6-hydroxydopamine-induced neurotoxicity on the locomotive behavior of zebrafish (PubMed:29285938). In vivo, has strong reversible antilocomotor activity (PubMed:29285938). In addition, it is lethal to zebrafish larvae at high doses (PubMed:29285938). LD(50) is 10-20 uM against zebrafish larvae. Belongs to the venom Kunitz-type family. Sea anemone type 2 potassium channel toxin subfamily.