Petri dish (IMAGE) University of Oldenburg Caption To find interaction partners, the researchers use the Two-Hybrid System, a technique involving petri dishes filled with a nutrient medium Credit University of Oldenburg Usage Restrictions Use only in connection with feature story and with appropriate credit. 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.