The NDS58 antibody reacts with all isoforms of CD45 (Leukocyte Common Antigen) on all hematopoietic cells, excluding the more mature erythroid cells, in strains expressing the RT7.1 alloantigen. The antibody does not react with the RT7.2 alloantigen. RT7.1 strains include ACI, AO, BN, DA, DZB, LEW, MAXX, PVG, SHR, and WAG; while BUF, LOU, and WF are RT7.2 strains. CD45 is a member of the Protein Tyrosine Phosphatase (PTP) family: Its intracellular (COOH-terminal) region contains two PTP catalytic domains, and the extracellular region is highly variable due to alternative splicing of exons 4, 5, and 6 (designated A, B, and C, respectively), plus differing levels of glycosylation. The CD45 isoforms detected in the rat are cell type-, maturation-, and activation state-specific. The CD45 isoforms play complex roles in T-cell and B-cell antigen receptor signal transduction.
The antibody was conjugated to BD Horizon™ BV421 which is part of the BD Horizon Brilliant™ Violet family of dyes. With an Ex Max of 407-nm and Em Max at 421-nm, BD Horizon BV421 can be excited by the violet laser and detected in the standard Pacific Blue™ filter set (eg, 450/50-nm filter). BD Horizon BV421 conjugates are very bright, often exhibiting a 10 fold improvement in brightness compared to Pacific Blue conjugates.