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Collee, G. (1989) ‘Food Poisoning’, New Scientist, 21 October 1989, IPC Magazines Ltd. http://www.newscientist.com. Diagrams by Peter Gardiner.
Figure 1 (top) Biophoto Associates; Figure 1 (bottom): Meidner, H. and Sheffiff, D.W. (1976) Water and Plants, Blackie and Sons Ltd.
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