Gating-modifier toxin with very weak activity on Nav1.7/SCN9A and Nav1.8/SCN10A. Shows 22% peak current inhibition (at 10 uM) on Nav1.8/SCN10A sodium channels. Show peak current inhibition and delays fast inactivation on Nav1.7/SCN9A (EC(50)>10 uM). 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. 47 subfamily.