GDF-11 vs. Myostatin (IMAGE) Cell Press Caption While myostatin expression decreases from 6 to 24 months in skeletal muscle rat, GDF-11 expression increases during this period. Credit Rudnicki et al./<i>Cell Metabolism</i> 2015 Usage Restrictions Credit Required. 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.