Test tubes (image) University of Turku Share Print E-Mail Caption These are test tubes. Credit Photo: Hanna Oksanen, University of Turku Usage Restrictions The photo may used with the credit information only. Share Print E-Mail 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.