Keith Maggert, University of Arizona (IMAGE) University of Arizona Caption Potentially dangerous genes embedded within human DNA were once thought to be locked down by helpful DNA structures called heterochromatin. A University of Arizona researcher disputes that belief and hopes to change the paradigm even further. Credit Kelvin Pond Usage Restrictions This visual may only be used in conjunction with reporting on or posting of this news release. Credit must be given as indicated. 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.