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PGP loop variations of the EBNA1 hexamer. (A) Superposition of the EBNA1 dimer from the hexamer (chains A and B) (dark blue) with the EBNA1 dimer bound to DNA (cyan) (PDB accession no. 1B3T) and rotated 90°. (B) Comparison of all three EBNA1 dimer PGP loops within the context of the hexamer. Dark blue, chains A and B; yellow, chains C and D; magenta, chains E and F.
