1XK4: Crystal Structure Of Human Calprotectin(S100a8s100a9)
reference: The crystal structure of the human (S100A8/S100A9)2 heterotetramer, calprotectin, illustrates how conformational changes of interacting alpha-helices can determine specific association of two EF-hand proteins., Korndorfer IP, Brueckner F, Skerra A, J Mol Biol. 2007 Jul 27;370(5):887-98. Epub 2007 May 3. PMID: 17553524

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