. "\"A protein ubiquitination process in which a polymer of ubiquitin, formed by linkages between lysine residues at position 6 of the ubiquitin monomers, is added to a protein. K6-linked ubiquitination is involved in DNA repair.\" [GOC:sp]" . . "protein K6-linked ubiquitination" . "protein K6-linked polyubiquitination" . .