 The structure of HNTX-III consists of 33-35 amino acid residues, which form a beta-sheet with connections between Asp7 and Cys9, Tyr21 and Ser23, and Lys27 and Val30.HNTX-IV has 35 amino acid residues with a total molecular weight of 3989 Da.The first strand consists of an antiparallel beta-sheet.