According to PubMed:15187158 it is a receptor for the CD200 cell surface glycoprotein. According to PubMed:16081818 it is not a receptor for the CD200/OX2 cell surface glycoprotein. Involved in the recruitment or surface expression of the TYROBP receptor. Expressed in bone marrow, spleen, brain, lung, testis and thymus. Belongs to the CD200R family.