. "The ubiquitination by a protein of one or more of its own amino acid residues, or residues on an identical protein. Ubiquitination occurs on the lysine residue by formation of an isopeptide crosslink." . . "protein autoubiquitination" . "protein auto-ubiquitination" . "protein auto-ubiquitinylation" . "protein autoubiquitinylation" . "protein self-ubiquitination" . "protein self-ubiquitinylation" . . .