A Weak Point (IMAGE) Rockefeller University Caption When the researchers plotted the locations of mutations (spheres) within the cystic fibrosis protein, they found that many are clustered at a vulnerable joint (lower right). Credit Laboratory of Membrane Biology and Biophysics at The Rockefeller University/Cell Usage Restrictions mage may be used only to illustrate the research described in the accompanying release. 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.