May function as a tissue-specific nuclear mRNA export factor. Interacts with NXT1, NXT2, E1B-AP5 and CRM1 nuclear export factor. Shuttles between the nucleus and the cytoplasm. Expressed at high level in testis and at low level in a small number of tissues. Lacks C-terminal domain that mediates direct interactions with nucleoporins. Contains a novel CRM1-dependent nuclear export signal that compensates in cis for the loss of the nuclear pore targeting domain. The RNA-binding domain is a non-canonical RNP-type domain. Belongs to the NXF family.