Serine protease inhibitor that inhibits both tissue and plasma kallikreins. Has hemolytic activity. Inhibits voltage-gated potassium channels (Kv). Belongs to the venom Kunitz-type family. Sea anemone type 2 potassium channel toxin subfamily. Opinions are divided on whether Anemonia viridis (Forsskal, 1775) and Anemonia sulcata (Pennant, 1777) are separate species.