4GMO:
reference: Synchronizing nuclear import of ribosomal proteins with ribosome assembly., Kressler D, Bange G, Ogawa Y, Stjepanovic G, Bradatsch B, Pratte D, Amlacher S, Strauss D, Yoneda Y, Katahira J, Sinning I, Hurt E, Science. 2012 Nov 2;338(6107):666-71. doi: 10.1126/science.1226960. PMID: 23118189

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