Active Motif's Histone H2A.XS139ph antibody (rAb) (H2AX) (Clone RM224) was raised in a Rabbit host. It has been validated for use in Immunocytochemistry and Western blot; it has been shown to react with Human samples, but it is predicted that it will react with a wide range of sample types. For more complete and up-to-date information, please visit the Active Motif website.