PCNA is a homotrimer and achieves its processivity by encircling the DNA , where it acts as a scaffold to recruit proteins involved in DNA replication , DNA repair , chromatin remodeling and epigenetics .
PROPN AUX DET NOUN CCONJ VERB PRON NOUN ADP VERB DET PROPN , ADV PRON VERB ADP DET NOUN PART VERB NOUN VERB ADP NOUN NOUN , NOUN NOUN , NOUN NOUN CCONJ NOUN .