Fly brain (IMAGE) University of Münster Caption Optical cross-section through a fly brain. The green colouring indicates the distribution of the extracellular matrix protein "Trol", which is formed by all enveloping glial cells. The subdivision of the brain into different reaction spaces becomes clear. Credit WWU - Nicole Pogodalla und Christian Klämbt Usage Restrictions The use of the image is permitted exclusively in connection with this press release and with reference to the source. 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.