Constipated Worm (IMAGE) University of Utah Caption Shown here are a normal round worm (top) and a constipated round worm (bottom). The arrow points to the constipated worm's gut, which is swollen with waste because scientists crippled the worm's ability to use protons like neurotransmitters. Credit Paola Nix, University of Utah. 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.