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Two examples of three-dimensional projections of multispecies aggregates. GFP-tagged E. coli cells from aggregate-rich cultures were mixed with predominately single-cell P. aeruginosa cultures. After 18 h of growth, the mixed cultures contained large proportions of aggregates with a central core of green GFP-tagged E. coli (marked with blue arrows) surrounded by a mixture of green E. coli cells and red mCherry-tagged P. aeruginosa cells.
