HEK 293/STAT5 Reporter (GFP) cells are derived from the human immortalized embryonic kidney cell line HEK 293 by stably integration of a STAT5 GFP reporter construct. HEK 293 cells have been widely used in cell biology research because of their reliable growth and propensity for transfection. HEK 293/STAT5 Reporter (GFP) cells stably express GFP under the control of the STAT5 response elements, can be used for monitoring the activity of STAT5 signaling pathway.