The s19.8 monoclonal antibody specifically recognizes the b and c alloantigens of β2 microglobulin, originally designated Ly-m11. β2 microglobulin is a 12 kDa protein, homologous to a single immunoglobulin constant-region domain, which is noncovalently associated with the MHC class I heavy chain. It may also associate noncovalently with CD1d in some cells types. Positive strains include C57BL/6, C57BL/10, C57BR, and C57L; whereas, A, AKR, BALB/c, C58, C3H, CBA, DBA/1, DBA/2, SJL, SWR, and 129 strains are negative.
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).