The Ba13 monoclonal antibody specifically recognizes Cell surface glycoprotein CD200 receptor 3 (CD200R3) which is also known as CD200 cell surface glycoprotein receptor-like b (CD200RLb), CD200 receptor-like 3, and OX-2 Receptor 3. CD200R3 is a single-pass type I transmembrane glycoprotein that is encoded by Cd200r3 (CD200 receptor 3) which belongs to the immunoglobulin superfamily (IgSF). It is expressed on basophils and mast cells that are involved in protective immune responses against parasitic infections and in the development of allergic reactions. Cell surface CD200R3 presents as a disulfide-linked dimeric CD200R-like receptor. The cytoplasmic tail region of CD200R3 contains a positively charged lysine residue which allows this receptor to associate and signal through adaptor proteins such as DAP10, DAP12, CD3z, or FcRγ. CD200R3 functions as an activating receptor to regulate IgE-independent immune responses.
The antibody was conjugated to BD Horizon™ BUV563 which is part of the BD Horizon Brilliant™ Ultraviolet family of dyes. This dye is a tandem fluorochrome of BD Horizon BUV395 which has an Ex Max of 348 nm and an acceptor dye. The tandem has an Em Max at 563 nm. BD Horizon BUV563 can be excited by the 355 nm ultraviolet laser. On instruments with a 561 nm Yellow-Green laser, the recommended bandpass filter is 585/15 nm with a 535 nm long pass to minimize laser light leakage. When BD Horizon BUV563 is used with an instrument that does not have a 561 nm laser, a 560/40 nm filter with a 535 nm long pass may be more optimal. Due to the excitation and emission characteristics of the acceptor dye, there may be spillover into the PE and PE-CF594 detectors. However, the spillover can be corrected through compensation as with any other dye combination.