4DNE:
reference: Contamination from an affinity column: an encounter with a new villain in the world of membrane-protein crystallization., Panwar P, Deniaud A, Pebay-Peyroula E, Acta Crystallogr D Biol Crystallogr. 2012 Oct;68(Pt 10):1272-7. Epub 2012 Sep 13. PMID: 22993081

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