Ion channel inhibitor. Expressed by the venom gland. The presence of a 'disulfide through disulfide knot' structurally defines this protein as a knottin. Belongs to the neurotoxin 10 (Hwtx-1) family. 51 (Hntx-8) subfamily. Hntx-8 sub-subfamily. While it is structurally defined as a knottin it lacks the conserved Cys residue in position 62. Truncated N-terminus.