The 9B9 monoclonal antibody specifically binds to CD368, which is also known as CLEC6 (C-type lectin-like receptor 6), CLEC4D, CLECSF8, and MCL (macrophage C-type lectin). CD368 is a 30 kDa type II transmembrane glycoprotein that belongs to the C-type Lectin Receptor family of molecules. It is primarily expressed on peripheral blood neutrophils and monocytes and weakly on several subsets of blood dendritic cells. Expression of this receptor is lost upon in vitro differentiation of monocytes into dendritic cells or macrophages. CD368 reportedly serves as an endocytic receptor that may function in antigen clearance and presentation to T lymphocytes. CD368 may also play roles in cellular adhesion, signaling and glycoprotein turnover. CD368 expression can be upregulated by cells in response to cytokines including IFN-γ, TNF, IL-6, and IL-10.
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).