was shown for the first time in contributing to the efficiency of the NLS.

Rotello et al. compared the nuclear localization efficiencies of eGFP fused NLSs of SV40 Large T-Antigen, nucleoplasmin (AVKRPAATKKAGQAKKKKLD), EGL-13 (MSRRRKANPTKLSENAKKLAKEVEN), c-Myc (PAAKRVKLD) and TUS-protein (KLKIKRPVK) through rapid intracellular protein delivery. They found significantly higher nuclear localization efficiency of c-Myc NLS compared to that of SV40 NLS.

Non-classical

There are many other types of NLS, such as the acidic M9

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