4PYU:
reference: The conserved ubiquitin-like protein Hub1 plays a critical role in splicing in human cells., Ammon T, Mishra SK, Kowalska K, Popowicz GM, Holak TA, Jentsch S, J Mol Cell Biol. 2014 Aug;6(4):312-23. doi: 10.1093/jmcb/mju026. Epub 2014 May, 28. PMID: 24872507

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