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™ BV711 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 711-nm. BD Horizon BV711 can be excited by the violet laser and detected in a filter used to detect Cy™5.5 / Alexa Fluor® 700-like dyes (eg, 712/20-nm filter). Due to the excitation and emission characteristics of the acceptor dye, there may be moderate spillover into the Alexa Fluor® 700 and PerCP-Cy5.5 detectors. However, the spillover can be corrected through compensation as with any other dye combination.