Nuclear Localization Sequence
A nuclear localization signal or sequence (NLS) is an amino acid sequence which 'tags' a protein for import into the cell nucleus by nuclear transport. Typically, this signal consists of one or more short sequences of positively charged lysines or arginines exposed on the protein surface. Different nuclear localized proteins may share the same NLS. An NLS has the opposite function of a nuclear export signal, which targets proteins out of the nucleus.
Read more about Nuclear Localization Sequence: Discovery of Nuclear Localization Signals, Mechanism of Nuclear Import
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