Intrinsically Photosensitive Retinal Ganglion Cell (ipRGC) (IMAGE) University of California - Berkeley Caption An intrinsically photosensitive retinal ganglion cell (ipRGC) as it would appear if you looked at a mouse's retina through the pupil. The white arrows point to the many different types of cells with which it networks: other subtypes of ipRGCs (red, blue and green) and retinal cells that are not ipRGCs (red). The white bar is 50 micrometers long, approximately the diameter of a human hair. Credit Image by Franklin Caval-Holme, UC Berkeley 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.