A nuclear localization sequence is an ordered stretch of amino acid residues that can direct protein import into a cell nucleus. In the classical pathway, importin α recognizes the nuclear localization sequence, and importin β mediates passage through the nuclear pore complex. Other recognition pathways exist. An exposed nuclear localization sequence is a targeting feature, not a guarantee of import under every condition.[ref]
RNA export is a different cargo pathway: RNA travels associated with proteins, as a ribonucleoprotein, rather than being imported by its own nuclear localization sequence. Export of messenger RNA connects nuclear transcription to cytoplasmic biological translation.[ref]

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  1. Nuclear pore complex
  2. Nuclear envelope
  3. Cell nucleus
  4. Biological cell
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