The phrase "nuclear export" refers to the process by which certain molecules or substances are transported out of the nucleus of a cell and into the surrounding cellular space. Full definition
A Phase 1/2 Open - label Study of the Safety, Tolerability and Efficacy of the Selective Inhibitor of Nuclear Export (SINE) Compound KPT - 8602 in Patients with Relapsed / Refractory Cancer Indications (vicc.org)
The combined treatment of ActD with leptomycin B, a small molecule nuclear export inhibitor, has been shown to successfully lead to the accumulation of transcriptionally active p53 in the nuclei of human papillomavirus positive cervical carcinoma cells, resulting in apoptosis of the cells [16]. (oncotarget.com)
The HIV genes that do remain are very important for viral production: Gag (structural precursor protein), Pol (polymerase), Tat (viral transactivator for transcriptional activation from the 5» LTR) and Rev (facilitates nuclear export of transcripts). (blog.addgene.org)