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Growth of strain Met 1 in the presence of individual heterotrophic members (A) and their lysates (B). Experimental conditions are the same as for Fig. 1. Symbols: ▴, control (strain Met 1 alone); ▵, Met 1 and Het 4; ○, Met 1 and Het 5; ▿, Met 1 and Het 1; □, Met 1 and Het 3; ◊, Met 1 and Het 2. The data are means ± standard deviations from triplicate bottles.
