Peptoid Nanotubes (IMAGE) DOE/Pacific Northwest National Laboratory Caption Scientists at PNNL have created a new family of nanotubes that are composed of peptide-like molecules called peptoids. These nanotubes start out as small droplets that come together to form a cell-membrane-like sheet. Then the sheet folds at one end and zips closed into a tube. Credit PNNL 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.