Nerve Cells (IMAGE) University of Münster Caption Microtubules (green) in the dendrites of nerve cells of fruit fly larvae. Left: During pruning, the microtubules first break down in the dendrites close to the cell body (thick dot in the middle). Right: If the polar orientation of microtubules is changed, they no longer degrade correctly. Credit S. Herzmann et al./Development Usage Restrictions The use of the image is permitted only in the context of this press release and with reference to the source. 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.