The transcription factor known as Nuclear Factor of Activated T cells (NFAT) binds to several sites within the regulatory region of the IL-2 gene and other genes induced during the immune response. Because its activation is inhibited by the main immunosuppressive drugs in current clinical use, cyclosporin A and tacrolimus (FK506), accurate monitoring of NFAT activation in cells, tissues and animals is crucial for biomedical research and drug development.


