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Map of the HPV18 URR. The diagram shows the three main regions of the HPV18 URR. The viral E1 and E2 sites are indicated on top (green and purple boxes). Binding sites for cellular factors that have been mapped to URR are indicated below by colored boxes (41, 42). The position of the del1, -2, and -3 deletions and the 7752 and 7817 5′ endpoints are shown.
