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A schematic drawing of the environmental residues around the guanine nucleotide. (A) GDP in the TmYjeQ GTPase domain. (B) GDP in ras protein (PDB ID code 4Q21). (C) Phosphoaminophosphonic acid-guanylate ester in ras protein (PDB ID code 1CTQ). The residues in the same position during substrates binding are yellow.
