According to PubMed:15187158 isoform 4 is a receptor for the CD200 cell surface glycoprotein. According to PubMed:16081818 isoform 4 is not a receptor for the CD200/OX2 cell surface glycoprotein. Isoform 1, isoform 2 and isoform 3 are involved in the recruitment or surface expression of the TYROBP receptor. Isoform 6, isoform 7 and isoform 8 are not involved in the recruitment or surface expression of the TYROBP receptor. Isoform 3 interacts with TYROBP. Isoform 8 does not interact with TYROBP. Expressed in uterus and bone marrow-derived mast cells (at protein level). Expressed in uterus, spleen, bone marrow-derived dendritic, basophil and mast cells. Expressed in the lung of N.brasiliensis-infected mice. Weakly expressed in brain, testis, lung and thymus. Expressed in uterus at 12.5 dpc (at protein level). Belongs to the CD200R family. According to some authors, isoform 3 (truncated at the N-terminus) is not a receptor for the CD200/OX2 cell surface glycoprotein.