As well, leukemias arising in animals transplanted with the same pool of transduced CB cells exhibited distinct clonal TCRG rearrangements (Figs. 2c, 3b; Supplementary Fig. 5) and also distinct donor STR patterns (Fig. 3c, Supplementary Fig. 6), suggesting that dominant, clonally rearranged leukemias had not already arisen in vitro prior to transplantation. Here, TRGC1 is linked to leukemia.