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Isolation and characterization of two importin-beta genes from rice.

The nuclear transport of proteins is mediated by the complex of importin-alpha and importin-beta. We isolated two cDNAs encoding importin-beta from rice. A rice importin-beta was demonstrated to interact with rice GST-importin-alpha fusion proteins. The presence of two importin-beta genes was shown for the first time among a variety of eukaryotes.