The OX-52 monoclonal antibody specifically recognizes CD6, a 95-120–kDa antigen expressed on T lymphocytes and thymocytes expressing αβ and γδ Tcell receptors. Rat NK cells express low levels of CD6 and are CD8a+, CD8b-, CD5-, and CD3-. In immunoprecipitation experiments, CD6 has been shown to co-precipitate with CD5 and to play a key role in CD5 tyrosine phosphorylation.
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.