Gels with Tunable Stiffness (IMAGE) Cell Press Caption This photograph shows molecular gels with tunable stiffness used to direct stem cell fate. Credit Alakpa <i>et al</i>./<i>Chem</i> 2016 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.