P. aurelia alone P. caudatum alone 300 08 70 250 200 150 - 40 30 100 20 50 - 10 10 15 20 10 15 20 Time (days) Time (days) (a) (b) Both species grown together 250 200 150 100 50 10 15 20 Time (days) Number of cells Number of cells Number of cells
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