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Time course of M. gallisepticum invasion into cultured HeLa-229 (A) or CEF (B) cells. Gentamicin invasion assays were performed as described in Materials and Methods with HeLa or CEF monolayers infected with Rlow (⧫), Rlowp3 (▴), Rlowp10 (■), and Rhigh (●). Each value represents the mean ± standard deviation of a minimum of three independent experiments performed in triplicate.
