Importins

 A class of karyopherins which bind to Ran-GDP to form complexes involved in the import of histones and target proteins through nuclear pores [1]. 

REFERENCES

1.Macara I. Transport into and out of the Nucleus. Microbiology and Molecular Biology Reviews [Internet]. 2001 [cited 3 December 2017];65(4):570-594. Available from: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC99041/