Nuclear Pore Complex Across Species (image) California Institute of Technology Share Print E-Mail Caption Proteins in the nuclear pore complex -- the gatekeeper between a cell's nucleus and cytoplasm -- are highly conserved across species. Credit Hoelz Lab/Dan Lin/Caltech Usage Restrictions Please use credit. Share Print E-Mail 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.