1GCJ:
reference: The adoption of a twisted structure of importin-beta is essential for the protein-protein interaction required for nuclear transport., Lee SJ, Imamoto N, Sakai H, Nakagawa A, Kose S, Koike M, Yamamoto M, Kumasaka T, Yoneda Y, Tsukihara T, J Mol Biol 2000 Sep 8;302(1):251-64. PMID: 10964573

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