The significantly higher number of IFN-γ-producing (p < 0.05; Figure 2(b)) and FasL- and granzyme B-expressing (p < 0.05; Figures 2(c) and 2(d)) NK cells in the tumors of B16F10+MSC1d-treated mice indicated that MSCs, injected 24 h after melanoma induction, enhanced cytotoxic and antitumorigenic potential of NK cells in tumor-bearing animals. The gene discussed is FASLG; the disease is melanoma.