May inhibit sodium (Nav) or calcium channels (Cav). Expressed by the venom duct. The presence of a 'disulfide through disulfide knot' structurally defines this protein as a knottin. The cysteine framework is VI/VII (C-C-CC-C-C). without PTMs. hydroxylated at 'Pro-14'. hydroxylated at 'Pro-4' and 'Pro-14'. carboxylated at 'Glu-7' and hydroxylated at 'Pro-14'. carboxylated at 'Glu-7' and hydroxylated at 'Pro-4' and 'Pro-14'.