Using DNA as a Molecular Ruler (IMAGE) California Institute of Technology Caption Caltech researchers used DNA as a "molecular ruler" to determine the ideal length to link two virus-binding parts, or Fabs, of antibodies. They also experimented with different mixes of Fabs -- either two of the same or two different. Credit Rachel Galimidi 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.