X Chromosome Silencing Experiment (IMAGE) Michigan Medicine - University of Michigan Caption Left, a male cell nucleus, in blue, shows in green the Xist RNA coating of the sole X-chromosome (white) that wasn't enough to silence the X-linked genes in red when researchers artificially tried to silence the sole X. Right, in a female cell nucleus, on the other hand, the Xist RNA coating silences the genes on the second white X chromosomes -- because genes on the first, already silent, X were able to aid the process. Credit Kalantry lab, University of Michigan Medical School 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.