Session 1 Development of Lymphoid Tissue and Germinal Centers in Relation to Phylogenesis.- Specific Immunoglobulin Synthesis in Lower Vertebrates Lacking Germinal Centers.- Theliolymphoid Organs - A New Look at the Lymphoepithelial Organs.- The Development of Lymphoid Systems: Immune Response and Radiation Sensitivity in Lower Vertebrates.- Studies on the Mature of Germinal Centers.- Session 2 Morphology and Functional Activity of Lymphoid Tissue and Germinal Centers.- Reticulum Arrangement Related to the Behavior of Cell Populations in the Mouse Lymph Node.- The White Pulp of the Human Spleen in Three Dimensions, and its Relation to Immunologic Function.- Cytophotometric and Autoradiographic Investigations on Germinal Center Cells in Man.- Differentiation Pathway within Germinal Centers of Human Tonsils.- Session 3 Cellular Kinetics of Lymphoreticular Tissue and Germinal Centers.- Germinal Centers and Immunological Memory.- Cytokinetic Studies on Tingible Bodies in Germinal Centers of Peyer's Patches in Mice.- Studies on the Kinetics and Radiation Sensitivity of Dendritic Macrophages.- Session 4 Origin and Migration of Lymphoid Cells.- Histophysiology of Germinal Centers and their Role in Antibody Response: An Autoradiographic Study in the Rabbit.- Mouse Blood Lymphocytic Origins Investigated by a Simple Cell Culture Technique.- Lymphatic Drainage of Thymic Lymphocytes in Mice.- Lymphoid Cell Migration and Germinal Centers.- The Mitotic Response of Thymus-derived Cells to a Variety of Different Antigens.- Session 5 Germinal Centers in Relation to Antigen Localization and Antibody Production, Part I.- The Relation of Antigen and Virus Localization to the Development and Growth of Lymphoid Germinal Centers.- Radiosensitivity of the Antigen-Trapping Mechanism and its Relation to the Suppression of Immune Response.- The Immunologic Specificity of Ferritin Uptake by Macrophages in the Rat.- Kinetic Studies on the Induction of Immune Tolerance to Protein Antigen in Sublethally X-Irradiated Rabbits.- Immunogenicity Decay of Foreign Antigens in the Mouse.- Detection of Virus Particles in Lymphatic Tissue Germinal Centers.- Session 6 Germinal Centers in Relation to Antigen Localization and Antibody Production, Part II.- Localization by Immunofluorescence of 19S and 7S Immunoglobulin in the Lymphoid Tissue of the Chicken and its relation to Specific Antibody Production.- Histologic Localization of Hemolysin-Containing Cells.- The Morphologic Sites of Bacteriolytic Antibody Formation to E. coll Antigen in Mice.- Immune Response in Mice: A Comparison of the Secondary Immune Response and the Response Elicited with Immune Complexes.- Cellular Changes and Gamma Globulin Production in MouseJSpleen Durinq Induction of Immunoloaical Tolerance.- Session 7 Role of Central Lymphoid Organs in Germinal Center Formation.- Germinal Center Formation and Antibody Production in Chickens Grafted In Ovo with Allogeneic Thymus, Bursa, and Spleen.- Developmental Suppression of Germinal Center and IgG Production by Prednisolone and 6-Mercaptopurine.- Regional Disparity of Germinal Center Development in Neonatally Thvmectomized Mice after Stimulation with Tetanus Toxoid.- Session 8 Germinal Centers in Delayed Sensitivity.- The Source of Cells within Different Areas of Lymph Nodes Draining the Site of Primary Stimulation with a Contact Sensitizing Agent.- Cytodynamics of the Immunological Response Evoked by Allooeneic Graft and Heterologous Erythrocytes.- Further Studies on the Relation between Germinal Centers and Cell-Mediated Injury.- Germinal Centers of Lymph Nodes and Spleen in Grafted Rats.- Alloantibody-Forming Cells in Skin Allografted Mice Detected by Immunocytoadherence.- Session 9 Effects of Immuno-Suppressive Agents on Lymphoreticular Tissue.- Morphological Changes in Lymphoid Tissues of Mice Treated with Anti lymphocyte Sera.- Modifications in Lymphoid Organs after Administration of a Horse Antidog Antilymphoid Serum.- Effect of Anti lymphocyte Serum on Mouse Lymphoid Tissues In Vivo and In Vitro.- Chemical Inhibition of Blastic Transformation in Phytohemagglutinin-Stimulated Lymph Nodes.- Session 10 Endocrine Aspects of Germinal Center Control.- Relationship between Developmental Hormones, the Thymus, and Immunological Capacity.- Hormonal Control of Lymphoreticular Tissues in Snell-Bagg Pituitary Dwarf Mice.- Session 11 Immunological Recovery of Lymphoid Tissue Following X-Irradiation.- In Vitro Reactivation of Antibody Response in Explants of Irradiated Spleens.- Effect of Isogenic Red Blood Cells Transfusion on the Immune Response of Mouse Radiation Chimeras.- Immunologic Restoration of X-Irradiated Spleen by Repopulation with Circulatinn Lymphocytes.- Session 12 Functional Selection of Lymphoid Cell Population.- Absence of Complement Binding by Immunoglobulin Aggregates in Germinal Centers.- Clonal Compartmentation in the Antibody-Producing Lymph Node.- Interaction between Two Distinct Cell Lineages in an Immune Response.- Session 13 Germinal Centers in Human Pathology.- Ultrastructural Studies of Splenic Germinal Centers in Idiopathic Thrombocytopenic Purpura.- Lymphatic Follicles and Immunologic Cell Reaction in Human Jejunal Mucosa Obtained by Peroral Biopsy in Infectious Hepatitis.- Germinal Centers, Hassall's Corpuscles, and Epithelioid Granulation Tissue.- Session 14 Germinal Centers in Neoplastic Disease.- Immunoglobulins in Pregnancy and Malignant Trophoblastic Disease.- Thymic Germinal Centers as Foci of a Lymphoma Resembling Burkitt's Tumor.- Immunoglobulin-Producing Cells in Human Pericancerous Lymph Nodes.

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