The Maxpar® Human T Cell Immuno-Oncology Expansion Panel Kit is designed to detect eight checkpoint and activation markers commonly expressed on activated T cells in oncology settings. When combined with the 16 antibodies in the Maxpar Human T Cell Phenotyping Panel Kit and the 10 antibodies in the Maxpar Human T Cell Phenotyping Expansion Panel Kit, it enables mapping of the expression patterns of the included checkpoint and activation markers on all major T cell subsets, including naïve, central memory, effector, and effector memory CD4+ and CD8+ cells; naïve and memory Tregs; and Th1 and Th2 cells. The combined panel also enables the classification of the activation and homing status of these T cell subsets. The Maxpar Human T Cell Immuno-Oncology Expansion Panel Kit can be used in combination with custom-designed panels. The kit contains all the reagents needed to run a CyTOF® experiment, including buffers optimized for staining and a nucleic acid intercalator used for single-cell identification.