Speargun (IMAGE) University of Basel Caption This is the structure of the bacterial nanosized speargun -- called type VI secretion system -- during contraction. Credit University of Basel, Biozentrum Usage Restrictions give adequate attribution to original author 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.