Scaffold Donut (image) NIH/National Institute of Biomedical Imaging & Bioengineering Share Print E-Mail Caption This is a diagram of scaffold donut showing grey-white matter compartmentalization. Rat neurons attached to the scaffold (donut ring) and also sent axons (labeled with green fluorescence) through the collagen gel-filled center. Credit National Institute of Biomedical Imaging and Bioengineering Usage Restrictions None Share Print E-Mail 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.