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Transmission electron microscopic observations of the hyphae and hyphal cell wall morphology of A. alternata grown under different conditions: (A) MM, (B) MM with the presence of 50 μg/mL of pyroquilon, (C) MMT, (D) MMT supplemented with 50 μg/mL of pyroquilon, (E) MMP and (F) MMP + 50 μg/mL of pyroquilon, after 3 days of growth. Arrow in (A) show an internal melanin layer. Bars, 1,000 nm.
