Social Amoeba with Fruiting Bodies (image) Washington University in St. Louis Caption Scientists have discovered that one clone of these amoebae carries two bacteria, one that serves it as food and another as a weapon. It's guns and butter, the scientists say. Credit Joan Strassmann Usage Restrictions please credit 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.