QuantumPlex™ SP (Single Population) is useful for the development of simplex flow cytometric assays, or for the optimization of attachment chemistry and assay parameters before transitioning to a multiplexed format. Like QuantumPlex™, they are dyed with Starfire Red™ and are suitable for use on standard flow cytometers. Carboxyl (COOH) and streptavidin surfaces are available. Carboxyl populations are at a concentration of ~1x108 beads/mL, while Streptavidin populations are at a concentration of ~1x106 beads/mL. QuantumPlex™ SP are available in two sizes: A (1mL) or B (3mL).: