1MB6:
reference: Function and solution structure of huwentoxin-IV, a potent neuronal tetrodotoxin (TTX)-sensitive sodium channel antagonist from Chinese bird spider Selenocosmia huwena., Peng K, Shu Q, Liu Z, Liang S, J Biol Chem 2002 Dec 6;277(49):47564-71. PMID: 12228241

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