This ERK5/BMK1 PAN PAb (Invitrogen) unconjugated polyclonal antibody is specific to human and mouse ERK5. This antibody is validated for use in Western blotting. Anti-ERK5 recognizes the expressed product of the MAPK7 gene. Catalog number 44688G is same antibody as former catalog number 44688. 44688G contains 50% glycerol, which improves the stability and longevity of this antibody.