Ghost-Like IgT (image) University of Pennsylvania Caption IgT, a fish mucosal immunoglobulin, surrounds a ghost-like Ichthyophtirius multifiliis, a skin parasite of rainbow trout. The parasite is stained in magenta, IgT is stained in green and the cell nuclei are stained with DAPI (blue). Credit Image courtesy of D. G. Atria and J. O. Sunyer, School of Veterinary Medicine, University of Pennsylvania Usage Restrictions With credit line: Image courtesy of D. G. Atria and J. O. Sunyer, School of Veterinary Medicine, University of Pennsylvania 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.