 Specialized export proteins exist for translocation of mature mRNA and tRNA to the cytoplasm after post @-@ transcriptional modification is complete . This quality @-@ control mechanism is important due to these molecules ' central role in protein translation . Mis @-@ expression of a protein due to incomplete excision of exons or mis @-@ incorporation of amino acids could have negative consequences for the cell ; thus , incompletely modified RNA that reaches the cytoplasm is degraded rather than used in translation . 
 Specialized export proteins exist for translocation of mature mRNA and tRNA to the cytoplasm after post @-@ transcriptional modification <a href='drop_aux' title='1'><mark>is</mark></a>complete . This quality @-@ control mechanism <a href='drop_aux' title='2'><mark>is</mark></a>important due to these molecules <a href='null_genetive' title='3'><mark>'</mark></a>central role in protein translation . Mis @-@ expression of a protein due to incomplete excision of exons or mis @-@ incorporation of amino acids could have negative consequences for the cell ; thus , incompletely modified RNA <a href='null_relcl' title='4'><mark>that</mark></a><a href='uninflect' title='5'><mark>reaches</mark></a> the cytoplasm is degraded rather than used in translation . 
Specialized export proteins exist fa translocation of mature mRNA and tRNA to the cytoplasm after post @-@ transcriptional modification complete . This quality @-@ control mechanism important due to these molecules  central role in protein translation . Mis @-@ expression of a protein due to incomplete excision of exons or mis @-@ incorporation of amino acids could have negative consequences for da cell ; thus , incompletely modified RNA reach tdacytoplasm is degraded rather than used in translation .