M3 contributes to gene expression , as it contains the polyadenylation signal followed by the cleavage and polyadenylation site , thereby contributing to pre- mRNA processing .
PROPN VERB ADP NOUN NOUN , ADP PRON VERB DET NOUN NOUN VERB ADP DET NOUN CCONJ NOUN NOUN , ADV VERB ADP ADJ PROPN NOUN .