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Structures of the frataxin monomer and trimer, denoting the typical α/β fold in which the α-helices pack against the β-sheet strands. (a) Structure of the human frataxin monomer (PDB: 3S4M). (b) Structure of the yeast frataxin trimer (PDB: 3OEQ). Note that in the trimer structure, unwinding of the N-terminal α-helix affords an interaction with a β-sheet from the nearby subunit.
