The 2.11 monoclonal antibody recognizes the Vγ1.1 chain of the heterodimeric γδ T-cell receptor (TCR γδ) expressed by T lymphocytes and NK-T cells. It does not react with TCR αβ-bearing T cells. TCR γδ associates with CD3 molecules to form the TCR γδ/CD3 complex that mediates antigen recognition and can transduce intracellular signals leading to T cell responses. The Vγ1.1 TCR is also known as Vγ1 TCR. The Vγ1.1 variable region TCR gene segment primarily rearranges to join the Jγ4 and Cγ4 TCR gene segments. TCR Vγ1-expressing cells represent a major population of TCR γδ cells in the adult mouse thymus, peripheral lymphoid tissues, and different epithelia. They constitute a minor population of TCR γδ-positive T cells during fetal and early postnatal life.
This antibody is conjugated to BD Horizon™ BV605 which is part of the BD Horizon Brilliant™ Violet family of dyes. With an Ex Max of 407-nm and Em Max of 602-nm, BD Horizon BV605 can be excited by a violet laser and detected with a standard 610/20-nm filter set. BD Horizon BV605 is a tandem fluorochrome of BD Horizon BV421 and an acceptor dye with an Em max at 605-nm. Due to the excitation of the acceptor dye by the green (532 nm) and yellow-green (561 nm) lasers, there will be significant spillover into the PE and BD Horizon PE-CF594 detectors off the green or yellow-green lasers. BD Horizon BV605 conjugates are very bright, often exhibiting brightness equivalent to PE conjugates and can be used as a third color off of the violet laser.