Anti-Ubiquitin Activating Enzyme antibody was used at a 10 ug/ml to detect UBE1 in a variety of tissues including adrenal, breast, colon (epithelium), kidney, liver, lung (respiratory epithelium), ovary (oocyte and endothelium), pancreas (islet and exocrine), placenta, prostate (epithelium), skin (epithelium), spleen (lymphocytes), stomach (chief), testis, thymus, tonsil, and uterus (glandular, stroma).