Determining the Threshold (IMAGE) University of California - Los Angeles Caption Mutations in the B cell's key molecular circuit in chickens, shown in green, resulted in ambiguity about whether the threshold, where the 0 line is, had been reached. Without these mutations, there were no such ambiguities, as the blue dots show. Credit Japan's RIKEN Center for Integrative Medical Sciences 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.