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SEM observations of lettuce root colonization by EGFP-S. exfoliatus FT05W, one to three weeks after lettuce sowing. Arrows indicate the hyphae inside one-week-old roots (A), two-week-old roots (B), 3-week-old roots (C), a spore chain in the 3-week-old roots (D). Scale bar equals to 10 μm (A,C,D) and 3 μm (B).
