Regulation of Permeability Across the Blood-Brain Barrier.- Drug Transporters at Brain Barriers: Expression and Regulation by Neurological Disorders.- The Blood-Retina Barrier: Tight Junctions and Barrier Modulation.- The Inner Blood-Retinal Barrier: Molecular Structure and Transport Biology.- Endothelial and Epithelial Barriers in Graft-Versus-Host Disease.- Structure and Regulation of Intestinal Epithelial Tight Junctions: Current Concepts and Unanswered Questions.- Polarity Protein Complex Scribble/Lgl/Dlg and Epithelial Cell Barriers.- The Blood-Biliary Barrier, Tight Junctions and Human Liver Diseases.- The Blood-Follicle Barrier (Bfb) in Disease and in Ovarian Function.- Physiology and Pathophysiology of the Epithelial Barrier of the Female Reproductive Tract: Role of Ion Channels.- The Blood-Epididymis Barrier and Human Male Fertility.- Blood-Tissue Barriers: Morphofunctional and Immunological Aspects of the Blood-Testis and Blood-Epididymal Barriers.- Gap Junctions and Blood-Tissue Barriers.- Transcriptional Regulation of Cell Adhesion at the Blood-Testis Barrier and Spermatogenesis in the Testis.- c-Src and c-Yes are Two Unlikely Partners of Spermatogenesis and Their Roles in Blood-Testis Barrier Dynamics.- Role of P-Glycoprotein at the Blood-Testis Barrier on Adjudin Distribution in the Testis: a Revisit of Recent Data.- The Apical Ectoplasmic Specialization-Blood-Testis Barrier Functional Axis is a Novel Target for Male Contraception.