Blocks voltage-gated potassium channels (Kv). Expressed by the venom gland. Belongs to the long chain scorpion toxin family. Class 2 subfamily. A mature protein with 47 amino acid residues is predicted in PubMed:17270501 (sequence of 45-91) instead of the chain proposed here (2 amino acids longer). Since the protein sequence and the predicted mass correspond exactly with proteomic data (PubMed:17270501), the 49 amino acid chain is shown.