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Effect of 4-methylcatechol (4-MC) application on protonemata of PPO1 knockout mutants and wild type. Tissue was cultivated under standard conditions in liquid medium supplemented with 50 µM 4-MC and cell vitality was displayed by FDA staining and microscopical observation after 48h of incubation (upper panel) and bright light microscopy (lower panel). Bars, 100 µm.
