Mixtures of 2.4 x 106 cells (at ratio of 2:1 of MAF: melanoma cells) of N1IC-GFP/MAF + 1205Lu vs. GFP/MAF + 1205Lu were co-grafted intradermally on dorsal skin of SCID mice (n = 6/group). The gene discussed is MAF; the disease is melanoma.