The 34-5-3 antibody reacts with the β chain of the I-A[d] MHC class II alloantigen. It cross-reacts with I-A[b] and with cells from mice of the H-2[p] and H-2[q] haplotypes. Reactivity with other haplotypes (e.g., a, f, k, r, s) has not been observed. The strain distribution of the antigen recognized by this reagent is similar to that of anti-I-A[b] mAb 25-9-17 (Cat. Nos. 553603, 553604, and 553605).
The antibody was conjugated to BD Horizon™ BV650 which is part of the BD Horizon Brilliant™ Violet family of dyes. This dye is a tandem fluorochrome of BD Horizon BV421 with an Ex Max of 405-nm and an acceptor dye with an Em Max at 650-nm. BD Horizon BV650 can be excited by the violet laser and detected in a filter used to detect APC-like dyes (eg, 660/20-nm filter). Due to the excitation and emission characteristics of the acceptor dye, there will be spillover into the APC and Alexa Fluor® 700 detectors. However, the spillover can be corrected through compensation as with any other dye combination.