'Untangling the Double Helix' (IMAGE) Cold Spring Harbor Laboratory Caption The cover of "Untangling the Double Helix" shows the prominent association of a DNA topoisomerase with the X-Y chromosome pair during meiosis in a mouse testis cell. Credit Cold Spring Harbor Laboratory Press Usage Restrictions None 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.