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Ribbon diagram representing the crystal structure of SbC4H1. Secondary structure elements have been numbered sequentially as A to L and β1 to β4. “N” and “C” refer to the N- and C-terminal regions, respectively. Color compositions indicate different secondary structural elements in SbC4H1. The heme is represented by a stick model. Molecular graphics images were produced using the Chimera package (UCSF).
