MYC and neoplasm: The ACTA2+ area was quantified in SmoM2;PB-MYC mice and PB-MYC littermates (n=6 mice, 44-45 weeks), as well as their non-tumor littermate controls, Gli1CreER/+;R26LSL-SmoM2-YFP/+ (SmoM2) (n=5 mice, 45 weeks) and R26LSL-SmoM2-YFP/+ (WT) (n=3 mice, 45 weeks) mice.