Nematode Worm (IMAGE) University of Liverpool Caption This is a nematode worm shown using fluorescence microscopy. The neuronal cells within the worm can be visualised specifically, as only these cells contain green fluorescent protein. Credit University of Liverpool 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.