c("age: Newborn", "cell type: CD4+ T cell")
c("age: Newborn", "cell type: CD4+ T cell")
c("age: Newborn", "cell type: CD4+ T cell")
c("age: middle-aged", "cell type: CD4+ T cell")
c("age: middle-aged", "cell type: CD4+ T cell")
c("age: long-lived subjects", "cell type: CD4+ T cell")
c("age: middle-aged", "cell type: CD4+ T cell")
c("age: long-lived subjects", "cell type: CD4+ T cell")
c("age: long-lived subjects", "cell type: CD4+ T cell")