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CFW staining of the hyphae of ΔB-18. ΔB-18 was grown on YG plates for 2 days (A) or 4 days (B and C), and ABPU/A1 was grown for 2 days (D). Internal regions (A, B, and D) and a marginal region (C) of the colonies are shown. Arrows indicate multilayered cell walls or intrahyphal hyphae. Arrowheads indicate wavy septa. Bars, 10 μm.
