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™ BUV496 which is part of the BD Horizon Brilliant™ Ultraviolet family of dyes. This dye is a tandem fluorochrome of BD Horizon BUV395 with an Ex Max of 348-nm and an acceptor dye with an Em Max at 496-nm. BD Horizon BUV496 can be excited by the ultraviolet laser (355 nm) and detected with a 515/30 nm filter with a 450LP. Due to the excitation of the acceptor dye by other laser lines, there may be significant spillover into the channel detecting BD Horizon V500 or BV510 (eg, 525/40-nm filter). However, the spillover can be corrected through compensation as with any other dye combination.