pink and green neurons 2 (IMAGE) Penn State Caption Lower magnification section of a brain showing neurons that have nNOS-expressing neurons labeled in green, DREADD-expressing neurons in magenta. Neurons that express both show up as white. Credit Jordan Norwood, Penn State Usage Restrictions non commercial use 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.