RB [pSpT249⁄252] PAb; Unconjugated Polyclonal antibody specific to Human, (Mouse, Rat) Rb [pS249⁄pT252]. This antibody is validated for use in Western Blot, Immunoassay (ELISA). Anti-Rb [pS249⁄pT252] recognizes the expressed product of the RB1 gene. Catalog number 44584G is same antibody as former catalog number 44584. 44584G contains 50% glycerol, which improves the stability and longevity of this antibody.