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PR1::GUS expression pattern under P. syringae pv. tomato incubation. Arabidopsis PR1::GUS seedlings were grown hydroponically and then transferred to liquid media containing P. syringae bacteria (final 0.002 OD600) or control media (mock). GUS activity in shoot and root was monitored by histochemical analyses at different time points. GUS expression in mock condition is shown for the last time point sampled (24 h).
