For more than ten years cell fusion techniques have been applied in studies on various lymphocyte functions. Ig expression was first studied in hybrids obtained by fusing myeloma cells with fibroblasts (1) or lymphomas (2), both of which do not produce Ig, and with Ig producing myelomas (3) or human blood lymphocytes (4). Kohler and Milstein (5) fused a myeloma with spleen cells from immunized mice. Up to 10% of the hybrids obtained secreted antibodies specific for the immunizing antigen. This suggested that plasma cells preferenti ally fused with the myeloma cells, a finding which was of enormous practical value. It was found that both Band T lymphocytes could be fused with the T cell tumor BW5147, which is however not permissive for Ig synthesis (6). A very large number of T cell hybridomas were generated by fusing BW5147 with cell populations containing in vivo or in vitro activated cells (7). The hybrids showed no specific T cell functions and binding assays for T cell receptors were not available. In particular, no hybrids were obtained which expreS1ed specific cytolytic activity that could be tested in short-term Cr release assays (8). However, the frustrations expressed about these failures, published in January, 1978 (9), were relieved by Taniguchi and Miller's publication a few months later of T cell hybridomas producing antigen-specific suppressor factors (10). Unfortunately, their hybrids rapidly lost factor production."

Never has so much progress been reported in immunology as at this congress. The full impact of new technologies, developed since the late 1970s, has come to fruition: gene isolation, mutation, transfection and expression, protein structure and peptide synthesis, cell cloning, hybridization and monoclonal antibodies, CD serology, SCID and transgenic mice, modern immunomudulation and vaccines. An overwhelming mass of data has accumulated over the last years. The reports are up-to-date and outstanding, to a degree no journal will ever achieve, and the results are presented in a concise and lucid way. This report will serve as a guideline for generations of immunologists to come. Hundreds of new alleys have been opened, an abundance of research tools and goals are pointed to. This volume is a treasure trove of explorations ahead of our time - it is exciting reading. This progress report presents outstanding contributions, worth many prizes - a feature which is unusual for proceedings volumes. Immunology is exhibited at its best: an exciting research area and a rewarding subject to study for the benefit of mankind - today more than ever!