核定位序列（NLS）是信号蛋白分子上与入核转运相关的氨基酸序列。

Nuclear localization sequence(NLS) is the specific amino acid sequence on the signaling proteins to be sufficient for their nuclear translocation.

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因此，蛋白质的核质转运作为介导胞核与胞质物质交换、信号交流的关键机制，在凋亡过程中就显得尤为重要。

Some of the apoptotic proteins, distributing in both cytoplasm and nucleus, shuttle between the two compartments by virtue of nucleocytoplasmic transport.

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