Long-term exposure to SWCNT, MWCNT, UFCB or ASB induces self-renewal and EMT-activating transcription factors. A-B: Western blot analysis and quantification of self-renewal transcription factors OCT4, NANOG, and SOX2 in particle-exposed SAECs; C-D: Western blot analysis and quantification of EMT-activating transcription factors ZEB1, SNAI2, and SNAI1. Data are mean ± SD (n=3). **p < 0.01, *p < 0.05 control cells. ϕϕp < 0.01 versus MWCNT-exposed cells. ππp < 0.01 versus UFCB-exposed cells. ##p < 0.01, #p < 0.05, versus ASB-exposed cells.