Retinal Section (Close-Up) (IMAGE) Northwestern University Caption Image from a mouse retinal section where cell nuclei are labeled in blue, RNA for the GABA synthesis enzyme Gad2 is labeled in magenta, and RNA for melanopsin is labeled in green. Credit Northwestern University 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.