STK11 and neoplasm: The data revealed that 6–4 photoproducts (6–4 pps), Dewar derivatives, and cyclobutane pyrimidine dimers were still detected at high rates in BrafCA;Lkb1−/− mice 7 days after UV irradiation, while they were almost completely repaired in wild‐type mice (Fig. 4D), supporting the role of Lkb1 in the generation of genomic instability and consequently tumor heterogeneity.