The CMRF-56 monoclonal antibody specifically binds to a 96 kDa, early activation/differentiation antigen expressed on dendritic cells (DCs). The CMRF-56 antigen is expressed on isolated Langerhans cells, dermal DCs, migratory dermal DCs and monocyte derived DCs (GM-CSF, IL-4, TNF-α). Circulating blood DCs are CMRF-56-, but its expression is induced within 6 hrs of in vitro culture. Tonsil and synovial fluid DCs upregulate CMRF-56 expression following short-term in vitro culture. It is not detected on resting peripheral blood leukocytes, but is on a subpopulation of tonsil B cells and on in vitro cultured CD19+ cells. CMRF-56 was generated using the Hodgkin's-derived L428 cell line as immunogen. This reagent could be useful in flow cytometric or immunomagnetic separation procedures and immunohistochemical staining of acetone-fixed frozen tissue sections.
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.