Required for nuclear import of FGF1, but not that of FGF2. Might regulate nuclear import of exogenous FGF1 by facilitating interaction with the nuclear import machinery and by transporting cytosolic FGF1 to, and possibly through, the nuclear pores. Can form homodimers. Interacts with SGO1. Interacts with FGF1. Localization in the nuclear envelope depends upon the nuclear import machinery, including KPNB1. Widely expressed. Truncated N-terminus. Truncated N-terminus.