Fig. 3From: Optically transparent vertical silicon nanowire arrays for live-cell imagingPhase contrast images of MDA-MB-231 breast cancer cells cultured for over 3Â h on flat glass (a, b) or transparent SiNW surfaces (c, d). Insets (b, d) illustrate the label-free localization of cellular nuclei (blue arrows) and lamellipodia (red arrows). Inset (e) illustrates the direct visualization of nanowire arrays by means of phase contrast microscopyBack to article page