Light Microscopic Image of Retina (IMAGE) Society for Neuroscience Caption This is a light microscopic image of retina showing the choroid (Ch), RPE, photoreceptor outer segments (OS), inner segments (IS), and outer nuclear layers (ONL). In IRBP knock-out mice, the outer segments are shorter, wider, and irregularly dispersed, and fewer nuclei are present in the ONL. Scale bar, 20 μm. Credit J Neurosci. 2009 Feb 4;29(5):1486 –1495. Usage Restrictions Permission is granted for reuse of this figure with citation for purposes of news coverage only. 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.