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Cross feeding of purines by wild-type P. aeruginosa or S. aureus and exogenous DNA. (A) Monocultures of wild-type as well as purine-deficient mutants of P. aeruginosa and S. aureus. (B) Cross feeding of purines to P. aeruginosa and S. aureus purine biosynthetic mutants by wild-type S. aureus and P. aeruginosa cells, respectively. (C) Rescue in growth of P. aeruginosa purine biosynthetic mutants by exogenous DNA.
