title: The nuclear envelope: its ultrastructure and functional significance.
mesh_terms: D000818:Animals; D001692:Biological Transport; D002462:Cell Membrane / Q000502:physiology; D002463:Cell Membrane Permeability; D002467:Cell Nucleus; D003593:Cytoplasm; D004721:Endoplasmic Reticulum; D008854:Microscopy, Electron