Figure 4.

Cytological examination of the labeled DNA distribution in MCF-7 cells. (a) Several minutes incubation of MCF-7 cells with FITC-labeled fragmented human DNA. The main part of the label is localized to the cytoplasm. (b) 14-h incubation of MCF-7 cells with FITC-labeled fragmented human DNA. The label is concentrated in the nucleus and is undetectable in the cytoplasm.