What's the function of integrins and cadherins?

• Integrins composed of two transmembrane subunits, α and β. The large extracellular domains of the α and β subunits combine to form a specific binding site for extracellular proteins. Collagen and fibronectin. • Cadherins are a class of type-1 transmembrane proteins. They forming adherens junctions to bind cells within tissues