The BAH-1 monoclonal antibody was raised against human megakaryocytic cells. It was originally proposed that clone BAH-1 was specific for human CD110, also known as c-Mpl or TPO-R. Data has emerged to suggest that BAH-1 antibody may not recognize CD110. However, there is strong evidence that it recognizes an antigen that is highly expressed on human Megakaryocyte-Erythroid Progenitor (MEP) cells. In combination with CD71, BAH-1 expression has been used to distinguish subsets of Hematopoietic Stem Cells and Myeloid Progenitors in human fetal liver, cord blood, and adult bone marrow. BAH-1 antibody can induce megakaryocytopoiesis of both mouse and human bone marrow cells in vitro.
The antibody was conjugated to BD Horizon™ BUV737 which is part of the BD Horizon Brilliant™ Ultraviolet family of dyes. This dye is a tandem fluorochrome of BD Horizon BUV395 with an Ex Max of 348-nm and an acceptor dye with an Em Max at 737-nm. BD Horizon Brilliant BUV737 can be excited by the ultraviolet laser (355 nm) and detected with a 740/35 filter. Due to the excitation of the acceptor dye by other laser lines, there may be significant spillover into channels detecting Alexa Fluor® 700-like dyes (eg, 712/20-nm filter).
Due to spectral differences between labeled cells and beads, using BD™ CompBeads can result in incorrect spillover values when used with BD Horizon BUV737 reagents. Therefore, the use of BD CompBeads or BD CompBeads Plus to determine spillover values for these reagents is not recommended. Different BUV737 reagents (eg, CD4 vs. CD45) can have slightly different fluorescence spillover therefore, it may also be necessary to use clone specific compensation controls when using these reagents.