Any process involved in the maintenance of an internal steady state of ubiquitin monomers and free ubiquitin chains at the level of the cell by recycling ubiquitin from proteasome-bound ubiquitinated intermediates. [GOC:BHF, GOC:dph, GOC:tb, PMID:19410548]
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C5: Ontology GO: Gene Ontology GO:BP: GO Biological Process