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Superposition of coordinates for structures Pmi1525 (PDB id: 3RHG), Rsp3690 (PDB id: 3k2g), and PTE (PDB id: 1dpm). The eight β/α loops from Pmi1525, Rsp23690, and PTE are depicted in magenta, green, and orange, respectively. The central β-barrel, the surrounding α-helices, and the two metal atoms are depicted in grey. The RMSD between grey colored parts of Pmi1525/Rsp3690, Pmi1525/PTE, and Rsp3690/PTE are 0.9, 1.0, and 1.1 Å, respectively.
