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Views of defined elements in the VP16 structure. (A) Network of internal charged interactions centered on residue K343. (B) Loop L-BC (red) between helix αK (yellow) and the seat bottom (blue). (C) Solvent-exposed and invariant arginines 214 and 217 and the discontinuity point of helix αG. [Produced by MOLSCRIPT (Kraulis 1991)].
