2WKF:
reference: The crystal structures of macrophage migration inhibition factor (MIF) from Plasmodium falciparum and Plasmodium berghei., Dobson SE, Augustijn KD, Brannigan JA, Schnick C, Janse CJ, Dodson EJ, Waters AP, Wilkinson AJ, Protein Sci. 2009 Oct 13. PMID: 19827093

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