BERKELEY, Calif., May 3, 2011 (GLOBE NEWSWIRE) -- XOMA Ltd. (Nasdaq:XOMA), a leader in the discovery and development of therapeutic antibodies, today announced that the National Institute of Allergy and Infectious Diseases (NIAID), part of the National Institutes of Health, has informed the Company that it is initiating a Phase 1 clinical trial for XOMA 3AB, XOMA’s novel formulation of three antibodies designed to prevent and treat botulism poisoning, among the most deadly bioterror threats.