The JR2 monoclonal antibody specifically recognizes the β-chain variable region (Vβ8) of the T-cell antigen receptor expressed on 0.5% to 3% of peripheral blood T cells. This antibody has been further characterized as having specificity to a major subset of the BV8 region as determined in the TCR Workshop of July 1995. Staphylococcal enterotoxin E has been shown to specifically stimulate T cells bearing Vβ8 (BV8).
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.