FunctionMay play a role in the processes of lymphocyte homing to secondary lymphoid organs.
Tissue specificityHighest expression in the heart, placenta, lung, foreskin and lymph node. Prominently expressed on high endothelial venules, also present on the endothelia of other vessels. Localized to the intercellular boundaries of high endothelial cells.
Sequence similaritiesBelongs to the immunoglobulin superfamily. Contains 1 Ig-like C2-type (immunoglobulin-like) domain. Contains 1 Ig-like V-type (immunoglobulin-like) domain.
Cellular localizationCell junction > tight junction. Cell membrane. Localized at tight junctions of both epithelial and endothelial cells.