A protein ubiquitination process in which ubiquitin monomers are attached to a protein, and then ubiquitin polymers are formed by linkages between lysine residues at various positions of the ubiquitin monomers, forming branched linkages, such as K11/K48- or K11/K63-linked chains. [PMID:29033132, PMID:29378950, PMID:31998699, PMID:37325469]
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C5: Ontology GO: Gene Ontology GO:BP: GO Biological Process