Immunogen sequence: TLENHTQNSS EVSPPSLNAD KPLEESPSTP LAPSQSQDSV NEPCSQPSGD RSLQTTSPPV VAPGNENGLA VPVPLRKSRP VSMDARIQVA QEKQVAEQGG. Ubiquitin: exists either covalently attached to another protein, or free (unanchored). When covalently bound, it is conjuga