RET and melanoma: Corresponding to our results of preliminary DNA microarray analysis using a benign melanocytic tumor and a primary melanoma in RET-mice, our RT-qPCR analysis showed that levels of Lsf transcript expression in benign tumors from RET-mice (lanes 1-6 in Figure 1A) were about 3-12-fold higher than those in melanomas from RET-mice (lanes 7-10 in Figure 1A).