Streptomyces (image) Duke University Share Print E-Mail Caption The soil bacteria Streptomyces form filamentous branches that extend into the air to create spiraling towers of spores. Duke researchers have discovered the switch that can turn off sporulation and turn on antibiotic production. Credit US Centers for Disease Control and Prevention Usage Restrictions None 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.