Western blot using Pogz polyclonal antibody (Cat # PAB11320) shows detection of Pogz protein (arrowhead) in adult mouse thymus and spleen tissue lysate (Panel A). The lower molecular weight bands may be cross reactive proteins. Pre-incubation of antibody with the immunizing peptide blocks specific antibody reactivity (Panel B). The primary antibody was used at 1 : 20,000. Personal Communication, K.O. Gudmundsson and J. Keller, NCI, Frederick, MD.