Correlating with slower tumor growth rates of YUMM2.1-dHLH tumors, the percentage of Ki67+ melanoma cells (Sox9+ or Sox10+ cells) were lower in YUMM2.1-dHLH compared to YUMM2.1-WT tumors (Supplementary Fig. 2g, h). The gene discussed is MKI67; the disease is neoplasm.