tokens: In HCMV ( Towne ) - infected HF cells at 24 to 48 h , IE2 also accumulated in newly formed viral DNA replication compartments containing the polymerase processivity factor ( UL44 ) , the single - stranded DNA binding protein ( SSB ; UL57 ) , the UL112 - 113 accessory protein , and newly incorporated bromodeoxyuridine ( BrdU ) .