Protein Crystal Grown in Space (IMAGE) NASA/Johnson Space Center Caption This is an image of Crystal of Trypsin grown in microgravity during Expedition 4 on the International Space Station. Credit NASA Usage Restrictions NASA 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.