The GL2 monoclonal antibody specifically reacts with Vδ 4 T-cell Receptor (TCR)-bearing T cells, which are the predominant γδ TCR-bearing cells in the adult intestinal epithelium (γδ IEL). The frequency of Vδ 4 TCR-bearing γδ IEL differs among inbred strains of mice and may be influenced by haplotypes of the MHC, Tcrg, and/or Tcrd gene complexes. There is evidence that these γδ IEL develop in the absence of thymic influence. T lymphocytes expressing Vδ 4 TCR have also been found in lactating mammary glands, the spleen, and the thymus.
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.