6IU7:
reference: Structural and biochemical characterization of the recognition of the 53BP1 nuclear localization signal by importin-alpha., Matsuura Y, Biochem Biophys Res Commun. 2019 Mar 5;510(2):236-241. doi:, 10.1016/j.bbrc.2019.01.075. Epub 2019 Jan 23. PMID: 30685087

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