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Site-directed mutants of GmRIC1 to determine effects of charge and size of amino acid substitutions. Multiple mutations were produced at two well-conserved residues within the CLE domain, L2 and E5. A, R, and N residues were substituted for L2, while A, R, T, and V were substituted for E5. The shaded R residue represents the only mutation that disrupted the complete suppression of nodulation.
