Stacked Interaction Domains (image) Washington University in St. Louis Caption The double-sided interaction domain may allow multi-protein chains to form. In Korasick's crystal, five of the ARF7 PB1 domains stuck to one another, forming a pentamer. "It was really beautiful to look at in the software, because you could actually see its spirals and turns," said Korasick. Credit Strader, Jez et al. Usage Restrictions please credit 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.