Lit Up Locus (image) Brown University Share Print E-Mail Caption Clamp (glowing green) is found all over these fly chromosomes, but it's particularly concentrated at the histone locus (red) at the bottom center. Credit Rieder, et. al. Usage Restrictions with credit Share Print E-Mail 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.