Flow chart of methodological steps. The methods are subdivided in a telomere and gamma-H2AX staining phase and a second, postelution phase, which include the IF staining of specific cell markers. Integration of data from phase 1 and 2 was done by scanning coordinates. Abbreviations: IF, immunofluorescence; CC10, club cell-10; FISH, fluorescence in situ hybridization; aSMA, smooth muscle actin.