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Z projection of laser-scanning confocal microscopy images of Bacillus firmus I-1582 transformed with the green fluorescent protein gene (Bf I-1582GFP) colonizing tomato (a,c) and cucumber (b,d) roots after 5 (a,b), and 10 (c,d) days after bacterial inoculation and incubation at 25°C. Scale bar: 50 μm. Autofluorescence of roots is shown in red.
