Gene Switch Implanted in T Cell Works (IMAGE) Georgia Institute of Technology Caption A heat-sensitive gene switch implanted in a sample of T-cells works in an in vitro check. Gentle pulses from a near-infrared laser directed at gold nanoparticles, which are also in the sample with the T-cells, transform into gentle heat and flip the switch on, activating the T-cells. The resulting signal appears as orange dots on a monitor in the background. Credit Georgia Tech / Allison Carter Usage Restrictions Press handout free for use in all reporting on Georgia Tech research or related research. 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.