Peptide sequence: ALKAVSDWID EQEKGSSEQA ESDNMDVPPE DDSKEGAGEQ KTEHMTRTLR Sequence homology: Cow: 86%; Dog: 86%; Guinea Pig: 79%; Horse: 93%; Human: 100%; Mouse: 79%; Rabbit: 86%; Rat: 79%. UBA6 (UBE1L2, MOP-4)is a novel E1 enzyme specific for ubiquitin a