The book describes a computational model of the immune system reaction, C-ImmSim, built along the lines of the computer model known as the Celada-Seiden model (CS-model). The computational counterpart of the CS-model is called IMMSIM which stands for IMMune system SIMulator. IMMSIM was written in 1992 by the physicist Phil E. Seiden and the immunologist Franco Celada. This model was built around the idea of developing a computerized system to perform experiments similar in vivo experiments; a tool developed to help biologists testing theories and hypothesis about how the immune system works. C-ImmSim is best viewed as a collection of models in a single program. It incorporates the principal core facts of today's immunological knowledge, such as the diversity of specific elements, MHC restriction, clonal selection, thymic education of T cells, antigen processing and presentation (both the cytosolic and endocytic pathways are implemented), cell-cell cooperation, homeostasis of cells created by the bone marrow, hyper mutation of antibodies, maturation of the cellular and humoral response, and memory. Besides, an antigen can represent a bacterium, a virus, or an allergen or a tumor cell. C-ImmSim has been recently customized to simulate the HIV-1 infection. Moreover, it can simulate the immunotherapy for cancer. These features are all present in the code and people can choose to turn them on and off at compiling time. The book presents the basic model as well as the various customizations to implement the description of different diseases and the way they have been used in practice to produce new knowledge either from hypothesis or from lab-experiment data. In this respect, the book can be used as a practical guide to implement a computational model with which to study a specific disease and to try to address realistic clinical questions.

T Cell Antigen and MHC Recognition; B. Boitel, et al. Structure of the TCR-Ag-MHC Complex; N. Gervois, et al. Positive and Negative Selection of T Cells; H. von Boehmer. Peripheral Tolerence; D.C. Parker. On the Antigenicity of Antibody Idiotypes; K. Hannestad. A Network of Self Interactions; M. Zanetti. Cloned Suppressor T Cells; T. Tada, et al. The Autoreactive T Cell Receptor; E. Heber-Katz. The Relationship Between Diabetes and Lymphopenia in the BB Rat; S. Joseph, et al. Immunosuppression by MHC Class II Blockade; L. Adorini. Recognition of HIV Antigens by Human T Helper Cells; F. Manca, et al. Proliferative Responses to the V3 Region of HIV Envelope Are Enhanced Following Immunization with V3; S.J. Harris, et al. Teaching Immunology; F. Celada, P.E. Seiden. Biospecific Monoclonal Antibody-Targeted Cytotoxic T Lymphocytes Can Recycle; J.A.C. Voorthuis, et al. 13 additional articles. Index.

This volume is the collection of papers presented during a four day meeting, the EMBO workshop "Protein Conformation as an Immunological Signal" that took place at Portovenere (La Spezia), Italy, October 1-4, 1981. The motivation that drove us to organize this meeting was the feeling that distinct groups of researchers, active in key areas of modern immunology, sometimes fail to communicate with each other simply because of different traditional affiliations. Yet it is urgent that "molecular" and "cellular" people cooperate more if immunology is to continue the exportation of new concepts to other disciplines. In fact, the deep meaning of molecule-molecule and cell-cell interaction, the generation of signals and their effective transmission which results in elicitation, control or suppression of responses cannot be unraveled without the experts on antibody structure or complement activation sharing their views with the experts on T cell, B cell and macrophage membrane receptors as well as the experts on factors that carry the information released by these cells. Whether the meeting was scientifically fruitful, the reader can judge after having digested these pages. We, the organizers, are not sure whether the optimal amount*of interaction had taken place; especially considering how hard it is to overcome the scientist's catch 22: You have to know something quite well before you get really interested in it. In any event, we are convinced that Portovenere was one of the most successful attempts we have witnessed.

This volume contains the contributions to the workshop "The Semiotics of Cellular Communication in The Immune System" which took place at "11 Ciocco" in the hills north of Lucca, Italy, September ~-12, 1986. The workshop was the first meeting of what we hope will be a broad consideration of communication among lymphocytes, and focused on the new interdisciplinary branch of biological sciences, immunosemiotics. It is in the realm of the possible, if not the probable, that in the future a number of scientists larger than the thirty present at 11 Ciocco will find immunosemiotics to fill a need in scientific thinking and a gap between biology and the humanities. This might lead to growth and flourishing of the branch, and in this case the first conference and this first book could be blessed by the impalpable qual ity of becoming "historical", if in an admittedly 1 imited sense. Just in case this should happen the organizers/editors think it wise to set the record straight at this particular time, about the sequen~e of events and circumstances that crystallized the archeology of the "11 Liocco" gathering. They feel a sort of obligation to this endeavor: it has happened all too often that innocent historians have been left in utter confusion by the careless founders of new religions, schisms, revolutions, et cetera, who simply forget to jot down the facts before the whirlwind of time engulfs them in its fog.

The book describes a computational model of the immune system reaction, C-ImmSim, built along the lines of the computer model known as the Celada-Seiden model (CS-model). The computational counterpart of the CS-model is called IMMSIM which stands for IMMune system SIMulator. IMMSIM was written in 1992 by the physicist Phil E. Seiden and the immunologist Franco Celada. This model was built around the idea of developing a computerized system to perform experiments similar in vivo experiments; a tool developed to help biologists testing theories and hypothesis about how the immune system works. C-ImmSim is best viewed as a collection of models in a single program. It incorporates the principal core facts of today's immunological knowledge, such as the diversity of specific elements, MHC restriction, clonal selection, thymic education of T cells, antigen processing and presentation (both the cytosolic and endocytic pathways are implemented), cell-cell cooperation, homeostasis of cells created by the bone marrow, hyper mutation of antibodies, maturation of the cellular and humoral response, and memory. Besides, an antigen can represent a bacterium, a virus, or an allergen or a tumor cell. C-ImmSim has been recently customized to simulate the HIV-1 infection. Moreover, it can simulate the immunotherapy for cancer. These features are all present in the code and people can choose to turn them on and off at compiling time. The book presents the basic model as well as the various customizations to implement the description of different diseases and the way they have been used in practice to produce new knowledge either from hypothesis or from lab-experiment data. In this respect, the book can be used as a practical guide to implement a computational model with which to study a specific disease and to try to address realistic clinical questions.