This panel allows the identification of regulatory CD4 T cells (Treg) using surface markers, and it is intended to be applied to sort or analyze Treg cells using flow cytometry. The panel does not contain any conjugated PE antibody to leave room to incorporate an antibody of choice in the analysis, using a common and bright fluorophore. Tregs are critical to maintain immune system homeostasis by suppressing the function of other cells. Thus, they help maintain a proper balance between healthy and disease states such as autoimmunity and cancer.