May mediate the cellular interaction between myeloid cells and B-cells. Forms a heterodimer, consisting of a large extracellular region (alpha subunit) non-covalently linked to a seven-transmembrane moiety (beta subunit). Glycosylated. Proteolytically cleaved into 2 subunits, an extracellular alpha subunit and a seven-transmembrane subunit. Due to a frameshift mutation in exon 8 would result in a truncated soluble form. Belongs to the G-protein coupled receptor 2 family. Adhesion G-protein coupled receptor (ADGR) subfamily. Could be the product of a pseudogene. A point deletion in exon 8, which introduces a frame shift leading to a premature stop codon. Thus, a protein expressed by this gene would be soluble rather than expressed on the cell surface. This single-nucleotide deletion has been acquired after human-chimpanzee speciation, about five million years ago.