GFP expression analysis of STAT5ab^–/– HW80 recipient mice injected as newborns with GFP transgenic donor cells. GFP expression in mice of different genotypes is shown for injected HW80 background mice. The percentage of GFP⁺ peripheral blood leukocytes of mice is shown for mice analyzed 16 weeks following injection. The number of mice injected in each group is shown below because many circles are overlapping. The genotypes of each group are shown below the graph.