The L17F12 monoclonal antibody specifically binds to CD5 which is also known as Lymphocyte antigen T1 (T1) or LEU1/Leu-1. CD5 is an ~67 kDa single-chain, type 1 transmembrane glycoprotein expressed on most thymocytes, the majority of peripheral T lymphocytes and a subpopulation of B cells. CD5+ B cells produce polyreactive antibodies (mostly IgM). This CD5-specific antibody also reacts with many T-cell leukemias and lymphomas and most Ig+ B-cell chronic lymphoblastic leukemia (B-CLL) cells. CD72 has been shown to be the natural ligand for CD5.
The antibody was conjugated to BD Horizon™ BV650 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 650-nm. BD Horizon BV650 can be excited by the violet laser and detected in a filter used to detect APC-like dyes (eg, 660/20-nm filter). Due to the excitation and emission characteristics of the acceptor dye, there will be spillover into the APC and Alexa Fluor® 700 detectors. However, the spillover can be corrected through compensation as with any other dye combination.