Magnosphere™ Human CD45RA Beads is a magnetic bead specifically designed for CD45RA positive cell separation and depletion. Anti-human CD45RA antibody (mouse) is biotinylated and immobilized onto the streptavidin coated sub-micron magnetic beads through a Streptavidin - Biotin interaction. The surface of the beads is covered with a JSR Life Sciences proprietary hydrophilic low non-specific binding polymer, which enables researcher to selectively separate CD45RA antigen expressing cells. The CD45RA is expressed on the surface of resting/naive T cells, medullary thymocytes, B cells and monocytes. The size of the magnetic beads, 100-200 nm, is small enough to use the separated cells for FCM assay.