what is cd1
CD1 (cluster of differentiation 1) is a family of glycoproteins expressed on the surface of various human antigen-presenting cells.They are related to the class I MHC molecules, and are involved in the presentation of lipid antigens to T cells.However their precise function is unknown.ypes [edit]. CD1 glycoproteins can be classified primarily into two groups which differ in their lipid anchoring. 1  CD1a, CD1b and CD1c (group 1 CD1 molecules) are expressed on cells specialized for antigen presentation.