Glimpse into the Nano-world (IMAGE) University of Vienna Caption This is a section of a chromosome with "DNA-break machines." Loops of sister chromatids (blue and turquoise) are linked and held in shape by ring-shaped molecules. The machines are anchored between the DNA-loops at the axis of the chromosome. One of the two machines holds on to a piece of DNA it just has broken. This model only illustrates the principles described in the text above; other details (such as the form of the machines, colors etc.) are symbolic and not to be taken literally. Credit Illustration: Franz Klein Usage Restrictions The illustration may only be used with appropriate caption or credit. License Licensed 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.