The 268318 monoclonal antibody specifically recognizes CD204 which is also known as Scavenger receptor class A member 1 (SR-A1 or SCARA1), Scavenger receptor type A (SRA-A), Macrophage acetylated LDL receptor I and II, or Macrophage scavenger receptor types I and II. CD204 is a trimeric type II transmembrane glycoprotein that is encoded by MSR1 (Msr1 macrophage scavenger receptor 1) which belongs to the type 1 class A scavenger receptor family. The C-terminal extracellular region of CD204 contains a scavenger receptor cysteine-rich domain followed by a collagen domain and an alpha-helical coiled coil. It is expressed on monocytes, macrophages, microglia, dendritic cells, and mast cells. CD204 is involved in the uptake of various negatively-charged macromolecules including modified proteins, polysaccharides, polyribonucleic acids, and microbial products and plays a role in innate and acquired immunity.
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).