Fig. 3: Repeated gas plasma exposure alters cytokine profiles released by squamous cell carcinoma cells.

a Heatmap showing median cytokine levels in SCC-25 and A431 cells 24 h after gas plasma treatment in wild-type or repeatedly exposed cells normalised to respective controls. b Principal component analysis (PCA) calculated from normalised secretion profiles of wild-type or repeatedly exposed SCC-25 and A431 cells.