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Comparison of the crystal structures of ligand-free PRs; closed-form (PDB ID: 1HVR), semi-open form (1HHP), open form (2PC0, 1TW7, 4NPU, and 3UF3), and the PR purified in this study. (A) RMSD calculations comparing the crystal structures by using the coordinates of the Cα atoms. (B) Comparison of each Cα atom in the PR structures with the corresponding Cα atom in the FS5929R1 PR.
