RAG2 and neoplasm: All but one Rag2−/− γc−/− mice (12/13) injected with transduced TC-71 cells showed a detectable signal over the left femur as early as 4–7 days after i.f. injection, whereas tumours at the site of maximum signal emission over the femur became detectable by palpation 20 days after i.f. transplantation at the earliest (Figure 8, Figure 9 and Table 2).