The MAR4 monoclonal antibody specifically binds to CD29. CD29 is a 130 kDa integrin β1 subunit that is expressed as a heterodimeric complex with one of six distinct α subunits, comprising the very late activation antigen (VLA) subfamily of adhesion receptors. The β1 subunit has a broad tissue distribution; it is expressed on lymphocytes, monocytes and weakly on granulocytes, but not on erythrocytes. These receptors are involved in a variety of cell-cell and cell-matrix interactions.
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.