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In page Nuclear pore complex:

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Different export pathways through the NPC for various RNA classes. RNA export is signal-mediated, with nuclear export signals (NES) present in RNA-binding proteins, except for tRNA which lacks an adapter. It is notable that all viral RNAs and cellular RNAs (tRNA, rRNA, U snRNA, microRNA) except mRNA are dependent on RanGTP. Conserved mRNA export factors are necessary for mRNA nuclear export. Export factors are Mex67/Tap (large subunit) and Mtr2/p15 (small subunit).[citation needed]