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Root hair curling assays using Nod factor extracts of Sinorhizobium fredii NGR234 and the NGR234-ΔtraI-ΔngrI double deletion mutant. Images in the upper and lower panel show root hair curling after 24 h induction with extracts of cultures treated either with 1 μM apigenin or the non-treated controls for the parent strain and the NGR234-ΔtraI-ΔngrI double deletion mutant.
