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Confocal laser microscopy images of B. fragilis strains expressing FbFP BS2 fluorescent protein. Panels A and B) B. fragilis BER-95 (638R ahpC::bs2): (A) anaerobic culture control; (B) after exposure to oxygen for 1 h. Panels C and D) B. fragilis BER-104 (IB263 ahpC::bs2): (C) anaerobic culture control; (D) after exposure to oxygen for 1 h.
