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Slime mould trail. Coloured scanning electron micrograph (SEM) of the trail (yellow) left by a slime mould of the species Physarum polycephalum. Bacteria (blue and green) and the slime mould's reproductive spores (orange) are seen in the track. Slime moulds were once thought to be fungi, but are now classed as a separate group. Most spend part of their life-cycle as a slug- shaped mass that can move slowly to find food. Magnification: x400 at 6x7cm size.
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