An on-off switch for gene editing (IMAGE) Whitehead Institute for Biomedical Research Caption A new CRISPR method allows researchers to silence most genes in the human genome without altering the underlying DNA sequence -- and then reverse the changes. Credit Jennifer Cook-Chrysos/Whitehead Institute Usage Restrictions Must credit Jennifer Cook-Chrysos/Whitehead Institute 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.