The B64 monoclonal antibody specifically recognizes Basal Cell Adhesion Molecule (BCAM, B-CAM) which is also known as CD239, Lutheran blood group antigen (Lu), or Lutheran glycoprotein. BCAM (CD239) is a type I transmembrane glycoprotein that is encoded by BCAM [basal cell adhesion molecule (Lutheran blood group)] which belongs to the Ig gene superfamily. Full-length BCAM (CD239) is comprised of an extracellular region with two N-terminal V-type Ig-like domains followed by three C2-type Ig-like domains, a transmembrane region, and cytoplasmic domain of 59 amino acid residues. The extracellular region of this adhesion molecule functions as a receptor for α5-chain containing laminins which are found in basement membranes whereas its cytoplasmic tail may have signal-transduction functions. BCAM (CD239) is expressed on erythrocytes and on the basal layer of vascular endothelial cells or some epithelial cells. BCAM (CD239) is highly expressed on sickle red cells and may play a role in vaso-occlusive crises in sickle cell disease. It is also upregulated upon malignant transformation of some cell types including those found in ovarian carcinomas.
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).