Arterial Cells Stained (IMAGE) Duke University Caption Staining on these slides shows that engineered human arteries produce contractile proteins (left) and calponin (right) just one week after being grown in culture. These two molecules allow the arteries to contract and dilate in response to environmental stimuli. Credit George Truskey 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.