The protein encoded by this gene is a cell surface transmembrane protein that may act as an erythroid cell receptor, possibly as a mediator of cell adhesion. Polymorphisms in this gene are responsible for the Scianna/Radin blood group system. Two transcript variants encoding the same protein have been found for this gene.,ERMAP,BTN5,PRO2801,RD,SC,Signal Transduction,Cell Biology & Developmental Biology,Cell Adhesion,Cell Adhesion Molecules,Cytoskeleton,Immunology & Inflammation,Stem Cells,Hematopoietic Progenitors,ERMAP