3ULR:
reference: Lysozyme contamination facilitates crystallization of a heterotrimeric cortactin-Arg-lysozyme complex., Liu W, Macgrath SM, Koleske AJ, Boggon TJ, Acta Crystallogr Sect F Struct Biol Cryst Commun. 2012 Feb 1;68(Pt, 2):154-8. Epub 2012 Jan 25. PMID: 22297987

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