Magnetic Tweezers (image) Brown University Share Print E-Mail Caption In this illustration, a DNA strand is leashed to a magnetized, iron-oxide bead, with a magnet hovering over it. As the bead moves toward the magnet, the DNA strand passes through nano-sized opening slowly enough that its base pairs can be read. Credit Hongbo Peng/IBM Research Usage Restrictions None 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.