The HIT3a monoclonal antibody specifically binds to the human CD3ε-chain, a 20 kDa subunit of the CD3/T cell antigen receptor complex found on 70-80% of normal human peripheral blood lymphocytes and 60-85% of thymocytes. Studies from the HLDA Workshop show that this antibody can be mitogenic for T lymphocytes. The CD3 complex plays a role in signal transduction during antigen recognition by the T cell receptor. HIT3a antibody does not stain intracellular CD3 unlike the other CD3-specific clone, UCHT1 (Cat. No. 555330/550368).
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.