KITLG and Autoimmunity: Since the F-box protein SUSA2, SGT1b, and HSP90.3 are all required for SOC3–CHS1-mediated autoimmunity in saul1-1 mutant, we hypothesized that components of an SCF E3 ligase complex may associate with NLR pairs SOC3–CHS1 or SOC3-TN2.