EXAMPLE:collagen, mucins, transferrin, ceruloplasmin, immunoglobulins, antibodies, histocompatibility antigens, hormones (e.g. follicle-stimulating, hormone, luteinizing hormone, human chorionic gonadotropin, thyroid-stimulating hormone, erythropoietin, alpha-fetoprotein), various enzymes (e.g. patatin, alkaline phosphatase), various proteins involved in cell to cell interactions, lectins, selectins
various protein receptors, especially involved in hormone and drug action, calnexin, calreticulin, certain regulatory proteins for growth and, development, certain surface protein membranes of platelets, particularly involved in thrombosis.