BERKELEY, Calif., July 16, 2007 (PRIME NEWSWIRE) -- XOMA Ltd. (Nasdaq:XOMA) today announced the initiation of Phase I clinical testing of product candidate XOMA 052, a potent monoclonal antibody targeting Interleukin-1 beta (IL-1 beta), in patients with Type 2 diabetes. IL-1, which plays a role in multiple inflammatory diseases, has been implicated in the pathogenesis of diabetes through the destruction of the pancreatic islet cells that produce insulin.