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Structure superposition of an HCO superfamily member (pdb id: 3mk7) and a MAPEG member (pdb id: 4al0). EU1, EU2, and EU3 of 3mk7 are shown in blue, yellow, and green, respectively. The heme groups and the non-heme iron are shown as red sticks and a red sphere, respectively. The three chains of 4al0 aligned to EU1, EU2, and EU3 of 3mk7 are shown in light blue, grey, and cyan, respectively. The ligands of 4al0 are shown as magenta sticks.
