Prototype Adaptive PCR Machine (IMAGE) Vanderbilt University Caption Prototype adaptive PCR device. The small sample in the center is illuminated by an ultraviolet laser on the right and varying levels of fluorescence are detected by the spectrophotometer on the left and are used to control the DNA duplication process. Credit Anne Rayner, Vanderbilt University 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.