The 11F2 monoclonal antibody specifically reacts with a framework epitope of the γ/δ TCR. The γ/δ TCR is a heterodimeric glycoprotein that is noncovalently associated with the CD3 antigen complex. The γ and δ TCR chains are composed of constant and variable regions, each encoded by distinct gene segments. The γ chain forms either disulfide-linked or non-disulfide-linked heterodimers with the δ-subunit. TCR γ/δ is present on a minor subset of T lymphocytes in peripheral blood, thymus, spleen, and lymph node. TCR γ/δ-positive T lymphocytes comprise 1% to 9% of normal peripheral blood lymphocytes and less than 2% of normal thymocytes. The 11F2 antibody is mitogenic for γ/δ-TCR-bearing T lymphocytes.
The antibody was conjugated to BD Horizon BUV615 which is part of the BD Horizon Brilliant™ Ultraviolet family of dyes. This dye is a tandem fluorochrome with an Ex Max near 350 nm and an Em Max near 615 nm. BD Horizon Brilliant BUV615 can be excited by the ultraviolet laser (355 nm) and detected with a 610/20 filter and a 595 nm LP. Due to the excitation of the acceptor dye by the blue/yellow-green laser line, there may be significant spillover into channels detecting PE-CF594 like emissions (eg, 610/20-nm filter).