Bioprinted Helix (IMAGE) Penn State Caption Bioprinting mesenchymal stem cell spheroids in the form of helix within a yield-stress gel. Credit Ozbolat Lab at Penn State Usage Restrictions non commercial use only 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.