Figure 1 (IMAGE) Shinshu University Caption One of the two X-chromosomes is randomly selected and inactivated in the early embryonic stage in females (X-chromosome inactivation). Credit Katsuhiko Tabuchi, Shinshu University, Japan 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.