Analysis of tumor-infiltrating lymphocytes (TILs) indicated that IL7-Fc injection did not increase the transfer of Thy1.1+CD8+ T cells, but increased the infiltration of endogenous Thy1.1−CD8+ T cells in immune-competent mice on day 13; this increase was impaired by inducing lymphopenia (Figure 1C). Here, IL7 is linked to lymphopenia.