In vivo transfection and detection of pre-microRNA by confocal microscope.

<p>Confocal images of MCF-7 (A, B, C) and MDA-MB-231 (D, E, F) cells after transfected with QD-RNA-Au NP probe loaded CS/γ-PGA complex, and MCF-7 cells after transfected with QD-control RNA-Au NP probe loaded CS/γ-PGA complex (G, H, I) at 37°C for 3 h: fluorescence field (A, D, G), bright field (B, E, H) and overlapped images (C, F, I).