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Ga-protoporphyrin inhibits intracellular growth of clinical isolate MC2638. THP-1 cells were transformed and infected with clinical isolate MC2638 for 1 h, washed, and cultured for up to 6 days in the presence of different concentrations of Ga-protoporphyrin as described in Materials and Methods. Ga-protoporphyrin significantly inhibited intracellular MC2638 (**, P < 0.001) as determined by CFU counting (A) or when data were normalized to the control (B) (*, P < 0.05; n = 4 replicates).
