Detection of single-stranded DNA in the nucleolus.

@article{Amalric1973DetectionOS,
  title={Detection of single-stranded DNA in the nucleolus.},
  author={F Amalric and Serge Bernard and Ren{\'e} Simard},
  journal={Nature: New biology},
  year={1973},
  volume={243 123},
  pages={38-41}
}
A GC-rich DNA is reported in the nucleolus of ascites tumour cells which was extracted in a single stranded form differing from that reported for newly replicated DNA.