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Schematic presentation of cis-regulatory elements identified in HPV16 and HPV18. (A) The HPV16 E6- and E7-encoding regions and the splice sites are indicated. Identified branch site and SA409 silencer are indicated. (B) HPV18 E6- and E7-encoding regions and the splice sites are indicated. Identified branch site and SA416 silencer are indicated. (C) HPV16 silencer sequence alignment with alpha-9 and alpha-7 groups.
