(A) Typical LSCM images of SNB-19 and LN-229 cells treated with YrFK, TPP3-YrFK, TPP6-YrFK (40 μM, 2 h) and stained with Mitotracker Red CM-H2XRos probe. (B) Relative density of mitochondria-associated fluorescence (red). Dotted line shows the signal for untreated cells. Mean ± SD (n = 10, ∗∗p < 0.01, ∗∗∗p < 0.001 vs. Ctrl) are shown. (For interpretation of the references to colour in this figure legend, the reader is referred to the Web version of this article.)