The OX-90 monoclonal antibody specifically recognizes CD200 (OX-2 antigen), a type-1 transmembrane glycoprotein containing two extracellular Ig-like domains. CD200 is expressed on thymocytes, neurons, B lymphocytes, splenic follicular dendritic cells and endothelium, and subsets of T lymphocytes and dendritic cells; but not on NK cells, granulocytes, monocytes, or macrophages. CD200 Receptor (CD200R; OX2R) expression is restricted to myeloid cells, and it appears that its engagement with CD200 results in inhibition and/or down-regulation of myeloid cell activity.
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.