4PKR:
reference: Anthrax toxin lethal factor domain 3 is highly mobile and responsive to ligand binding., Maize KM, Kurbanov EK, De La Mora-Rey T, Geders TW, Hwang DJ, Walters MA, Johnson RL, Amin EA, Finzel BC, Acta Crystallogr D Biol Crystallogr. 2014 Nov;70(Pt 11):2813-22. doi:, 10.1107/S1399004714018161. Epub 2014 Oct 16. PMID: 25372673

This OCA Structure page
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