Conceptual Image (1 of 2) (image) University of Washington Caption This conceptual image shows probe and target complexes at different stages of the reaction that checks for mutations. The red dots represent mutations in a target base pair, while sequences with illuminated green lights indicate that no mutation was found in the reaction. Credit Yan Liang, L2XY2.com Usage Restrictions Photo credit required. 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.