1T0Z:
reference: Structure of an excitatory insect-specific toxin with an analgesic effect on mammals from the scorpion Buthus martensii Karsch., Li C, Guan RJ, Xiang Y, Zhang Y, Wang DC, Acta Crystallogr D Biol Crystallogr. 2005 Jan;61(Pt 1):14-21. Epub 2004, Dec 17. PMID: 15608371

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