2GNU:
reference: Lipidic sponge phase crystallization of membrane proteins., Wadsten P, Wohri AB, Snijder A, Katona G, Gardiner AT, Cogdell RJ, Neutze R, Engstrom S, J Mol Biol. 2006 Nov 17;364(1):44-53. Epub 2006 Jul 7. PMID: 17005199

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