The 28-8-6 monoclonal antibody specifically recognizes the H-2K[b] and H-2D[b] MHC class I alloantigens. The reaction with H-2K[b] has been reported to be stronger than that with H-2D[b]. Its recognition of H-2D[b] is dependent upon the presence of β2 microglobulin. Cross-reactivity with an epitope on the N-terminal domains, α1 and α2, of the H-2D[d] MHC class I alloantigen has also been described. Reactivity with other haplotypes (e.g., f, k, p, q, r, s) has not been observed.
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).