Tomatidine hydrochloride, solasodine, and sarsasapogenin were purchased from Sigma Aldrich (St. Louis, Missouri, USA) and dissolved in absolute ethanol (EtOH) to a final concentration of 5 mM. Tomatine (Santa Cruz Biotechnology) was prepared in absolute EtOH to a final concentration of 2.5 mM. Naringenin was purchased from Santa Cruz Biotechnology (Dallas, Texas, USA) and dissolved in absolute EtOH to a final concentration of 50 mM. All stock solutions were stored at −20 °C and used for a maximum of 3 months. The final EtOH concentration was below 0.1% in all infection experiments.
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