Match the following cell adhesion molecules to their primary functions or characteristics:

Cell Adhesion Molecules	Characteristics
a. Integrin	(i) Mediate calcium-dependent cell-cell adhesion and are important in maintaining tissue structure.
b. Selectin	(ii) Primarily involved in the immune response, allowing leukocytes to roll along the vessel wall during inflammation.
c. Cadherin	(iii)  Involved in the formation of hemidesmosomes and focal adhesions, linking cells to the extracellular matrix.
d. Immunoglobulin (Ig) superfamily	(iv) Involved in immune responses, mediating cell-cell recognition and adhesion through antigen recognition.