Model of the Secretion System (IMAGE) University of Würzburg Caption This is a model of the secretion system of <i>Mycobacterium smegmatis</i>. At its center, the pore is clearly visible. This enables the nanomachine to secrete a large number of specialized effector proteins. Credit Sebastian Geibel 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.