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™ BUV496 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 496-nm. BD Horizon BUV496 can be excited by the ultraviolet laser (355 nm) and detected with a 515/30 nm filter with a 450LP. Due to the excitation of the acceptor dye by other laser lines, there may be significant spillover into the channel detecting BD Horizon V500 or BV510 (eg, 525/40-nm filter). However, the spillover can be corrected through compensation as with any other dye combination.