The Model Legume Medicago Rruncatula (IMAGE) University of Wisconsin-Madison Caption The model legume Medicago truncatula. The plant and its bacterial symbiont were used in a landmark University of Wisconsin-Madison study to detail the proteins involved in the process of nitrogen fixation, where plant nutrients are drawn from the atmosphere. Credit Dhileepkumar Jayaraman and Shanmugam Rajasekar/Ane lab Usage Restrictions None 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.