Retina Cross-section (IMAGE) University of California - Santa Cruz Caption A cross-section of healthy retina shows S-cone bipolar cells (marked by *) in the inner nuclear area. Each bipolar cell sends a single dendrite toward the photoreceptor ribbons (magenta) to synapse with a single S-cone photoreceptor (blue). Credit Beier et al, 2018, <i>Current Biology</i> Usage Restrictions For use only with news coverage of this research 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.