CD25, also named IL-2Rα, is the α chain of the interleukin 2 receptor (IL-2R). IL-2Rα associates with the IL-2Rβ chain (CD122) and the common γ chain (CD132) to form the functional IL-2R complex. CD25 is a type I transmembrane protein present on activated T cells, activated B cells, some thymocytes, myeloid precursors, and oligodendrocytes. Though CD25 has been used as a marker to identify CD4+FoxP3+ regulatory T cells in mice, it has been found that a large proportion of resting memory T cells constitutively express CD25 in humans.

Each lot of antibody has been tested by flow cytometry staining. Researchers are recommended to further titrate this antibody at the optimal concentration for each specific application.

Store at 2 °C ~ 8 °C, protected from prolonged light exposure. DO NOT FREEZE.