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Rgg is expressed in strain MGAS315. (A) Diagram of Rgg indicating the position of the N-terminal helix-turn-helix (HTH) motif and the amino acid variation at position 103. (B) Cytoplasmic proteins isolated from wild-type MGAS315 (wt) (lane 1) and an isogenic rgg mutant derivative (lane 2) analyzed by immunoblotting using antibodies to Rgg.
