This panel allows the identification of activated CD8 T cells using surface markers, and it is intended to be applied to sort or analyze 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. Activated CD8 T cells are a critical component of an immune response. Often called cytotoxic T lymphocytes or CTLs, are important for immune defense against intracellular pathogens such as viruses and bacteria, as well as tumor control. They may also contribute to autoimmunity when homeostasis of the immune system fails.