2K3U:
reference: Structure of the tyrosine-sulfated C5a receptor N terminus in complex with chemotaxis inhibitory protein of Staphylococcus aureus., Ippel JH, de Haas CJ, Bunschoten A, van Strijp JA, Kruijtzer JA, Liskamp RM, Kemmink J, J Biol Chem. 2009 May 1;284(18):12363-72. Epub 2009 Feb 27. PMID: 19251703

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