The J90-462 monoclonal antibody specifically recognizes CD6. CD6 is a 105-130 kDa type I transmembrane glycoprotein that belongs to the scavenger receptor family. It is expressed on most thymocytes and peripheral T cells. CD6 is highly expressed on CD3-high thymocytes and expressed at lower levels on CD4+ CD8+ double positive and CD4+CD8- or CD4-CD8+ single positive thymocytes. CD6 is also reportedly expressed at low levels by some neurons. CD6 serves as a receptor for CD166, also known as Activated Leukocyte Cell Adhesion Molecule (ALCAM). CD6 plays a role in adhesion and migration during organogenesis. The CD6 intracellular domain is constitutively phosphorylated which suggests that CD6 may play a signaling role in T cell activation.
The antibody was conjugated to BD Horizon™ BUV737 which is part of the BD Horizon Brilliant™ Ultraviolet family of dyes. This dye is a tandem fluorochrome of BD Horizon BUV395 with an Ex Max of 348-nm and an acceptor dye with an Em Max at 737-nm. BD Horizon Brilliant BUV737 can be excited by the ultraviolet laser (355 nm) and detected with a 740/35 filter. Due to the excitation of the acceptor dye by other laser lines, there may be significant spillover into channels detecting Alexa Fluor® 700-like dyes (eg, 712/20-nm filter).
Due to spectral differences between labeled cells and beads, using BD™ CompBeads can result in incorrect spillover values when used with BD Horizon BUV737 reagents. Therefore, the use of BD CompBeads or BD CompBeads Plus to determine spillover values for these reagents is not recommended. Different BUV737 reagents (eg, CD4 vs. CD45) can have slightly different fluorescence spillover therefore, it may also be necessary to use clone specific compensation controls when using these reagents.