E.3 Use of monoclonal antibodies to demonstrate absence of T cell development in early-thymectomized Xenopus: John Horton1, Trudy Horton1, Pamela Ritchie1 Ian Gravenor1, Lanier Gartland2, Max Cooper2 1Department of Biological Sciences, University of Durham, Durham, UK, and 2Wallace Tumor Institute, University of Alabama, Birmingham, Alabama, USA