1KQI:
reference: Solution structures of the cis- and trans-Pro30 isomers of a novel 38-residue toxin from the venom of Hadronyche Infensa sp. that contains a cystine-knot motif within its four disulfide bonds., Rosengren KJ, Wilson D, Daly NL, Alewood PF, Craik DJ, Biochemistry 2002 Mar 12;41(10):3294-301. PMID: 11876637

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