The RM2-5 monoclonal antibody specifically binds to the immunoglobulin superfamily adhesion molecule, CD2 (LFA-2). CD2 is a type I transmembrane glycoprotein that serves as the the major receptor for CD48 in the mouse. CD2 is involved in T-cell activation, immunoregulation, and thymocyte maturation. In the mouse, CD2 is expressed on peripheral T lymphocytes, B lymphocytes, and NK cells, and a subpopulation of intraepithelial T lymphocytes. CD2 is expressed throughout mouse thymic ontogeny, except for distinct subsets of the CD4-CD8- early thymocytes. In the mouse bone marrow, CD2 is expressed on B220+ sIg+ CD43- pre-B cells, but not on CD43+ pro-B cells. The RM2-5 antibody is one of a set of five anti-mouse CD2 monoclonal antibodies that were classified into two groups according to their mutual competition in binding to cell surface CD2 and which block CD2-mediated cell-cell adhesion.
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.