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.
This antibody is conjugated to BD Horizon™ BV605 which is part of the BD Horizon Brilliant™ Violet family of dyes. With an Ex Max of 407-nm and Em Max of 602-nm, BD Horizon BV605 can be excited by a violet laser and detected with a standard 610/20-nm filter set. BD Horizon BV605 is a tandem fluorochrome of BD Horizon BV421 and an acceptor dye with an Em max at 605-nm. Due to the excitation of the acceptor dye by the green (532 nm) and yellow-green (561 nm) lasers, there will be significant spillover into the PE and BD Horizon PE-CF594 detectors off the green or yellow-green lasers. BD Horizon BV605 conjugates are very bright, often exhibiting brightness equivalent to PE conjugates and can be used as a third color off of the violet laser.