Integrin alpha-6/beta-1 (ITGA6:ITGB1) is a receptor for laminin on platelets. Integrin alpha-6/beta-1 (ITGA6:ITGB1) is present in oocytes and is involved in sperm-egg fusion. Integrin alpha-6/beta-4 (ITGA6:ITGB4) is a receptor for laminin in epithelial cells and it plays a critical structural role in the hemidesmosome. Heterodimer of an alpha and a beta subunit. The alpha subunit is composed of a heavy and a light chain linked by a disulfide bond. Alpha-6 associates with either beta-1 (ITGB1) or beta-4 (ITGB4) to form ITGA6:ITGB1 and ITGA6:ITGB4, respectively. Alpha-6 levels decrease with age. Phosphorylated in vivo. Belongs to the integrin alpha chain family.