Western blot using Sepw1 polyclonal antibody (Cat # PAB11324) shows detection of endogenous Sepw1 in mouse brain, muscle and testes lysates. Recombinant Sepw1 is also detected at 10 ng (right lanes). The arrow corresponds with Sepw1 protein at 9.6 kDa. The primary antibody was used at a 1:1000 dilution. Personal Communication, D. Hatfield, NCI, Bethesda, MD.