<unk> , also known as Fc epsilon RII, or FcεRII, is the "low-affinity" receptor for IgE, an antibody isotype involved in allergy and resistance to parasites, and is important in regulation of IgE levels. Unlike many of the antibody receptors,<unk>  is a C-type lectin. It is found on mature B cells, activated macrophages, eosinophils, follicular dendritic cells, and platelets. There are two forms of<unk> :<unk> a and<unk> b.<unk> a is present on follicular B cells, whereas<unk> b requires IL-4 to be expressed on T-cells, monocytes, Langerhans cells, eosinophils, and macrophages.
CD23
CD74
CD80
CD22
CD137
CD86
IL-2 receptor
CD44