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GD-Box motif of TSRs. The residues involved in the characteristic hydrogen bond network of the GD box of loop 2 for (A) refined AbrBN53 structure, (B) AbrBN53 structure by Coles et al., (C) refined structure of AbhN, and (D) refined structure of SpoVTN. Key residues involved in the GD box hydrogen-bonding network are depicted. Thick red lines indicate hydrogen bonds necessary for GD-Box formation.
