Fig. 1

Conditioned media. a Preparation of the human embryonic mesenchymal lung conditioned medium (hEML-CM) and the control tumor-conditioned medium (T-CM). b Phase-contrast images of culture containing mesenchymal lung cells at 9 weeks (E9) of embryonic development. c Positive vimentin staining of E9 mesenchymal lung cells. d TGF-β1 levels in hEML-CM and T-CM as measured in the cell culture supernatants by ELISA. Data represent the mean ± SEM from at least three separate experiments. *p < 0.05