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Scanning electron micrographs of infected RAW264.7 macrophages. Macrophages were infected for 6 h with (a) wild-type Y. pseudotuberculosis YPIIIpIB1, (b) YPIIIp506, (c) YPIIIp503, or (d) uninfected control. Note membrane blebbing on the surface of cells infected with YPIIIpIB1 and YPIIIp503. Macrophages infected with YPIIIp506 appear slightly rounded compared to uninfected cells, but the membrane blebbing is absent.
