NK-92MI/STAT5 Reporter (GFP) cells are derived from the human natural killer cell line NK-92MI by stably integration of a STAT5 GFP reporter construct. NK-92MI cells have been widely used in immunological research, particularly in studies related to cancer immunotherapy. NK-92MI/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.