Placental cells (IMAGE) Institut Pasteur Caption Placental cells are stained blue (nuclei) and the reactive oxygen species produced by mitochondria are stained red by fluorescence. The levels of these reactive species are altered during preeclampsia. Credit © Laurent Chatre, Institut Pasteur/CNRS Usage Restrictions © Laurent Chatre, Institut Pasteur/CNRS License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.