Weak serine protease inhibitor that has been tested on both trypsin and elastase (PubMed:29285938). In vivo, is not lethal to zebrafish larvae (PubMed:29285938). LD(50) is >100 uM against zebrafish larvae. Belongs to the venom Kunitz-type family. Sea anemone type 2 potassium channel toxin subfamily.