title: Proof that certain RNAs shuttle non-randomly between cytoplasm and nucleus.
mesh_terms: D000656:Amoeba; D000818:Animals; D001345:Autoradiography; D002466:Cell Nucleolus / Q000032:analysis; D002467:Cell Nucleus / Q000032:analysis / Q000378:metabolism*; D003584:Cytological Techniques; D003593:Cytoplasm / Q000032:analysis / Q000378:metabolism*; D006651:Histocytochemistry; D006652:Histological Techniques; D007553:Isotope Labeling; D008854:Microscopy, Electron; D053652:Nuclear Transfer Techniques; D012313:RNA / Q000302:isolation & purification / Q000378:metabolism*; D014158:Transcription, Genetic; D014316:Tritium
chemical_list: D014316:Tritium; D012313:RNA