 The complete amino acid sequence of HNTX-IV is NH2-ECLGFG KGCNPS NDQCCK SSNLVC SRKHRW CKYEI-CONH2.Lys 27, His28, Arg29 and Lys 32 are the neuroactive amino acid residues.HNTX-V consists of 35 amino acid residues.