These domains are disulphide rich extracellular domains. These domains are found in several extracellular receptors and may be involved in protein-protein interactions.
Description
The egg peptide speract receptor is a transmembrane glycoprotein [MEDLINE:8140623]. Other members of this family include the macrophage scavenger receptor type I (a membrane glycoprotein implicated in the pathologic deposition of cholesterol in arterial walls during artherogenesis), an enteropeptidase and T-cell surface glycoprotein CD5 (may act as a receptor in regulating T-cell proliferation).
Description text is from InterPro entry IPR001190
CD molecules are leucocyte antigens on cell surfaces. CD antigen nomenclature is updated at http://mpr.nci.nih.gov/prow/.