IL-7 enhances T-cell recovery after TCD BMT. RAG-1^–/– mice received TCD BMT followed by IL-7 or PBS administration from day 7 until the end of the experiment. RAG-1^–/– mice received 5 × 10⁶ syngeneic TCD CD45.1⁺ bone marrow cells. IL-7 was given subcutaneously twice daily (2 × 500 ng) from day 7 to day 63. T-cell recovery was evaluated weekly in mice treated with PBS (□,n = 21) and mice treated with IL-7 (▪, n = 21). Mean absolute numbers (± SE) of CD3⁺ T cells/μL are shown.