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Models for RetS-GacS tetramers. Binding between the two proteins could be asymmetric (Model 1), where only one DHp-DHp interface forms. This model allows for the possible formation of a polymer consisting of repeat units of asymmetric tetramers linked through DHp-DHp interactions. Alternatively, RetS and GacS could form a symmetric tetramer with two DHp-DHp interfaces (Model 2).
