Importins
importins
Importin is a type of protein that moves other protein molecules into the nucleus by binding to a specific recognition sequence, called the nuclear localization signal (NLS). Importin is classified as a karyopherin.   Importin has two subunits, importin alpha and importin beta. Members of the importin-beta family can bind and transport cargo by themselves, or can form heterodimers with importin-alpha.