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Transmission electron microscopy of R. australis-infected BMMs. Double-membrane-bound vacuoles containing rickettsiae (arrowheads) were found at 1 h (A, B) and 3 h (C, D) p.i. Arrow, double membranes either as fragments (A, B and D) or as a complete double membrane (C). Bars = 100 nm. Data represent those from three independent experiments.
