However, it may be significant that only EcArgR and VvArgR, which appear to lack α4, both have an Arg residue in α5.
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Conserved Dynamic Mechanism of Allosteric Response to L-arg in Divergent Bacterial Arginine Repressors.
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However, it may be significant that only EcArgR and VvArgR, which appear to lack α4, both have an Arg residue in α5.