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CD155 is a transmembrane glycoprotein member of a subfamily of immunoglobulin-like adhesion receptors (nectins). CD155 is commonly known as Poliovirus Receptor (PVR) because of its involvement as a cellular receptor for poliovirus. The normal function of CD155 is to establish intercellular adherens junctions between epithelial cells. Of its 3 extracellular immunoglobulin-like domains (D1, D2, and D3), the virus only recognizes D1. CD155 interacts with both CD226 and CD96 to induce cytotoxicity of NK cells and CTL. The precise role of CD155 in the immune system remains to be elucidated, though it is suspected to be involved in intestinal humoral immune responses. Furthermore, it is thought that CD155 may be used to positively select MHC-independent T cells in the thymus.