1. 1) Cohen, J. J.: Apoptosis. Immunol. Today, 14: 126-130, 1993
2. 2) Smith, C. A., Williams, G. T., Kingston, P., et al.: Antibodies to CD 3 /T-cell receptor complex induce death by apoptosis in immature T cells in thymic cultures. Nature, 337: 181-184, 1989
3. 3) Nossal, G. J. V.: Cellular mechanisms of immunologic tolerance. Ann. Rev. Immunol., 1: 33-62, 1983
4. 4) Liu, Y-J., Joshua, D. E., Williams, G. T., et al.: Mechanisms of antigen-driven selection in germinal centers. Nature, 342: 929-931, 1989
5. 5) Gabrieli, Y., Sherman, Y., Ben-Sasson, S. A.: Identification of programmed cell death in situ via specific labeling of nuclear DNA fragmentation. J. Cell Biol., 119: 493-501, 1992