4RTD:
reference: Structure of protease-cleaved Escherichia coli alpha-2-macroglobulin reveals a putative mechanism of conformational activation for protease entrapment., Fyfe CD, Grinter R, Josts I, Mosbahi K, Roszak AW, Cogdell RJ, Wall DM, Burchmore RJ, Byron O, Walker D, Acta Crystallogr D Biol Crystallogr. 2015 Jul 1;71(Pt 7):1478-86. doi:, 10.1107/S1399004715008548. Epub 2015 Jun 30. PMID: 26143919

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