Measuring Peptide Mass Using Nanopores (IMAGE) University of Groningen Caption A peptide enters the thin end of the nanopore, and there changes the current in proportion to its mass. By using differently sized nanopores, a range of peptide sizes can be measured. Credit G. Maglia / University of Groningen Usage Restrictions With credit. 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.