We have also shown that in leukemia, as shown for other diseases12,14,26,27, a large percentage of tissue-resident ST2+ Treg cells express KLRG1 and that frequencies of KLRG1+ST2+ Treg cells are correlated with total ST2+ Treg cells, although slightly smaller than total ST2+ Treg cells. Here, KLRG1 is linked to leukemia.