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Liver kinase B1 (Lkb1), encoded by serine/threonine kinase (Stk11), is a serine/threonine kinase and tumor suppressor that is strongly implicated in Peutz–Jeghers syndrome (PJS). Numerous studies have shown that mesenchymal‐specific Lkb1 is sufficient for the development of PJS‐like polyps in mice. However, the cellular origin and components of these Lkb1‐associated polyps and underlying mechanisms...