GluN1-2C, GluN1-2A-2C, and GluN1-2D (IMAGE) Cold Spring Harbor Laboratory Caption The structures of understudied NMDA receptors: GluN1-2C, GluN1-2A-2C, and GluN1-2D. The top row shows the 3D atomic models, the bottom row graphic representations. The different colors illustrate different variations of subunits that make up the receptors. Depending on which variations they have, the NMDA receptors take on different shapes. Credit Furukawa Lab Usage Restrictions Attribution required License Original 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.