Noun
importin (plural importins)
(biology) Any of various karyopherins that move other protein molecules into the cell nucleus by binding to a specific recognition sequence.
Inside the nucleus, RanGTP acts to separate the cargo from the importin, allowing the importin to exit the nucleus and be reused. Source: Internet
Nuclear import depends on the importin binding its cargo in the cytoplasm and carrying it through the nuclear pore into the nucleus. Source: Internet
These Nups would bind to an importin, once formed, preventing the assembly of a prepore in the cytoplasm. Source: Internet