Seems to play a role in epithelial tight junction formation. Appears early in primordial forms of cell junctions and recruits PARD3 (PubMed:11489913). The association of the PARD6-PARD3 complex may prevent the interaction of PARD3 with JAM1, thereby preventing tight junction assembly (By similarity). Plays a role in regulating monocyte transmigration involved in integrity of epithelial barrier (By similarity). Ligand for integrin alpha-L/beta-2 involved in memory T- cell and neutrophil transmigration (PubMed:11812992). Involved in platelet activation (PubMed:10753840). {ECO:0000250|UniProtKB:O88792, ECO:0000269|PubMed:10753840, ECO:0000269|PubMed:11489913, ECO:0000269|PubMed:11812992}. (Microbial infection) Acts as a receptor for Mammalian reovirus sigma-1. . (Microbial infection) Acts as a receptor for Human Rotavirus strain Wa. . This is the function of ENSG00000158769 (F11R, F11 receptor).