Nuclear pores in rodent heart cells (IMAGE) University of Pittsburgh Caption Electron microscopy images of fetal (left) and infant (right) rodent heart cell nuclei. As heart cells develop, the number of nuclear pores decreases. Credit Han et al., 2022, Developmental Cell, 10.1016/j.devcel.2022.09.017 Usage Restrictions For use with embargoed release License Original 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.