Antibiotics (image) Wyss Institute for Biologically Inspired Engineering at Harvard Share Print E-Mail Caption Antibiotics cause oxidative stress in cells, which leads to cellular damage. For example, in healthy cells (left), mitochondria, which are labeled yellow here, are long and highly branched. But in cells treated with the antibiotic ciprofloxacin (right), mitochondria are abnormally short and unbranched, and they do not function as well. Credit Sameer Kalghatgi and Catherine S. Spina Usage Restrictions Credit: Sameer Kalghatgi and Catherine S. Spina Share Print E-Mail 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.