IgG is an important component of the humoral immune response, helping to control infection. IgG is produced by plasma B-cells and may be found in extracellular fluids, such as blood, lymph, peritoneal, and cerebrospinal fluids. IgG monomers consist of two light and two heavy chains containing two antigen binding sites. There are four IgG subclasses found in human, mouse and rat species, which include IgG1, IgG2, IgG3 and IgG4. The G18-145 monoclonal antibody specifically binds to the heavy chain of human immunoglobulin G subclasses: IgG1, IgG2, IgG3 and IgG4. The G18-145 antibody has been reported not to react with the heavy chains of other human immunoglobulin isotypes.
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).