title: Letter: Clones, microcolonies or "tumourlets" in irradiated lung.
mesh_terms: D002999:Clone Cells; D003201:Computers; D004307:Dose-Response Relationship, Radiation; D006801:Humans; D008168:Lung / Q000528:radiation effects*; D008962:Models, Theoretical; D011830:Radiation Effects; D011879:Radiotherapy Dosage