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Heterogeneous culture. a Density-dependent gradient test of a heterogeneous culture with bacterial bands in both the top and bottom phases. b Isolate AB41 with a mucoid phenotype and its density-dependent gradient test (insert in B) with a single band in the top phase. c Isolate AB20 with a non-mucoid phenotype and its density-dependent gradient test (insert in C) with a single band settled in the bottom phase
