Immunogen sequence: THKLKTITGN SAAVITPFKL TTEATQTPVS NKKPVFDLKA SLSRPLNYEP HKGKLKPWGQ SKENNYLNQH VNRINFYKKT YKQPHLQ. Ubiquitin: exists either covalently attached to another protein, or free (unanchored). When covalently bound, it is conjugated to target