Structure and Function of the Gut Mucosal Immune System -- Functional Aspects of the Mucosal Immune System -- Recent Progress in Inflammatory Bowel Disease Genetics -- Microbial and Dietary Factors in the Pathogenesis of Chronic, Immune-Mediated Intestinal Inflammation -- Experimental Models of Mucosal Inflammation -- Overview of Role of the Immune System in the Pathogenesis of Inflammatory Bowel Disease -- The Role of the Epithelial Barrier in Inflammatory Bowel Disease -- Involvement of Dendritic Cells in the Pathogenesis of Inflammatory Bowel Disease -- Alterations of T Lymphocytes in Inflammatory Bowel Diseases -- The B-Cell System in Inflammatory Bowel Disease -- Alterations of Mesenchymal and Endothelial Cells in Inflammatory Bowel Diseases -- Role of Mast Cells and Eosinophils in Neuroimmune Interactions Regulating Mucosal Inflammation in Inflammatory Bowel Disease -- Multiparameter Analysis of Immunogenetic Mechanisms in Clinical Diagnosis and Management of Inflammatory Bowel Disease -- The Role of Probiotics and Antibiotics in Regulating Mucosal Inflammation -- From Immunogenic Mechanisms to Novel Therapeutic Approaches in Inflammatory Bowel Disease.