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™ BV650 which is part of the BD Horizon Brilliant™ Violet family of dyes. This dye is a tandem fluorochrome of BD Horizon BV421 with an Ex Max of 405-nm and an acceptor dye with an Em Max at 650-nm. BD Horizon BV650 can be excited by the violet laser and detected in a filter used to detect APC-like dyes (eg, 660/20-nm filter). Due to the excitation and emission characteristics of the acceptor dye, there will be spillover into the APC and Alexa Fluor® 700 detectors. However, the spillover can be corrected through compensation as with any other dye combination.