4QQB:
reference: Structural basis for the assembly of the Sxl-Unr translation regulatory complex., Hennig J, Militti C, Popowicz GM, Wang I, Sonntag M, Geerlof A, Gabel F, Gebauer F, Sattler M, Nature. 2014 Sep 7. doi: 10.1038/nature13693. PMID: 25209665

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