1NA6:
reference: Crystal structure of type IIE restriction endonuclease EcoRII reveals an autoinhibition mechanism by a novel effector-binding fold., Zhou XE, Wang Y, Reuter M, Mucke M, Kruger DH, Meehan EJ, Chen L, J Mol Biol 2004 Jan 2;335(1):307-19. PMID: 14659759

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