Angiotensin Action (IMAGE) Duke University Caption Just as squeezing the top of a balloon changes its overall shape, the interaction of hormones and drugs in the bloodstream changes the shape of cell surface receptors. A pair of new papers map those shapes in detail, giving researchers hope of developing more specific, more effective medications. Credit Lefkowitz Lab, Duke University Usage Restrictions None 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.