What are the main families of integral proteins of cell membrane?

-Immunoglobulins: and integrins involved in immune activity and cell adhesion (Ca dependant) (mediate interaction between lymphocytes and macrophages, Antiibodies and T receptors are a kind of it CAM cell adhesion molecules) -Cadherins: glycoproteins, mediate Ca cell adhesion and communication with surrounding, found at surface of many animal cells. -Selectins : glycoproteins able to recognize and bind to specific sugar motif proturding from cell. Some CAM are selectins, mediate temporary interaction between leukocytes and endothelial cells, at site of inflammation allowing infiltertation.