Metastatic Delivery (IMAGE) University of Massachusetts Amherst Caption BacID (green) seeks and colonizes a metastatic breast cancer nodule – the size of the width of a single strand of hair – in the lung (blue). Credit UMass Amherst Usage Restrictions None License Original 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.