1QUZ:
reference: Structural and functional consequences of the presence of a fourth disulfide bridge in the scorpion short toxins: solution structure of the potassium channel inhibitor HsTX1., Savarin P, Romi-Lebrun R, Zinn-Justin S, Lebrun B, Nakajima T, Gilquin B, Menez A, Protein Sci 1999 Dec;8(12):2672-85. PMID: 10631983

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