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™ 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.