Flow cytometry facilitates quantitative, multiparameter analysis of cell populations based on the expression of cell surface and/or intracellular molecules. R&D Systems offers a wide range of biotin-, fluorescein-, phycoerythrin-, or allophycocyanin-conjugated monoclonal antibodies specifically designed to monitor the presence of cytokines and cytokine receptors as well as Fluorokine® kits; labeled cytokines that can be used to monitor the presence of cytokine receptors.

• Cell Surface Staining Antibodies for Flow Cytometry
  A rapid and simple method to immunophenotype cell populations.
• Fluorokine Receptor Detection Kits
  Biotinylated ligands for estimating receptor densities
• Intracellular Staining Antibodies for Flow Cytometry
  Intracellular staining reagents offer a rapid and simple method to identify cells that secrete selected cytokines, e.g. Th1 vs. Th2. A variety of fluorochrome-labeled isotype controls, conjugated with the same fluorochrome to protein ratio, are available to aid in assessing background staining.
• Multi-Color Flow Cytometry Kits
  Kits to simultaneously label cells with up to four antibodies conjugated to four different fluorochromes