The Dominance of Antigen-Specific Receptors in Antigen-Specific Immune Responses.- I Adhesion Molecules.- Integrins and Their Ligands.- Platelet Endothelial Cell Adhesion Molecule (CD31).- CD44: A Multitude of Isoforms with Diverse Functions.- The Selectins and Their Ligands.- II Regulation of Leukocyte-Endothelial Cell Adhesion.- A Model of Leukocyte Adhesion to Vascular Endothelium.- Regulation of Adhesion Receptor Expression in Endothelial Cells.- Regulation of Leukocyte Recruitment by Proadhesive Cytokines Immobilized on Endothelial Proteoglycan.- III Lymphoid Cell Homing Mechanisms.- Migration of Activated Lymphocytes.- The Peyer's Patch Homing Receptor.- Pro-T Cell Homing to the Thymus.- Quantitative Analysis of Lymphocyte Fluxes In Vivo.- Lymphocyte Recirculation and Life Span In Vivo.- IV Leukocyte Homing to Inflamed Tissues.- The Contributions of Integrins to Leukocyte Infiltration in Inflamed Tissues.- Regulation of Adhesion and Adhesion Molecules in Endothelium by Transforming Growth Factor-?.- Transendothelial Migration.- V Adhesion Molecules in Differentiation and Activation of Lymphocytes.- CD44 and Other Cell Interaction Molecules Contributing to B Lymphopoiesis.- CD4, CD8, and CD2 in T Cell Adhesion and Signaling.- Activation and Inactivation of Adhesion Molecules.