Human nuclear pore complex (IMAGE) European Molecular Biology Laboratory Caption The human nuclear pore complex (NPC) is a doughnut-shaped molecular complex consisting of 30 different proteins arranged in ca. 1000 copies. It weighs 120 MDa, which in the cellular scale is enormous. Credit Agnieszka Obarska-Kosińska/EMBL and MPI of Biophysics Usage Restrictions Credit must be given to the creator. Only noncommercial uses of the work are permitted. Adaptations must be shared under the same terms. License CC BY-NC-SA 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.