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CD3 CD19 double-negative lymphocytes in spleens of mice infected with S. Enteritidis SPI mutants; n.i. - non-infected mice. The Y-axis shows percentage of CD3 CD19 double-negative lymphocytes out of total CD45 positive splenic lymphocytes. Columns SPI2pos and SPI2neg show average values for all mice clustered into two groups according to being infected with either any of the SPI-2 positive or the SPI-2 negative mutants. * - t-test different from SPI2neg at P < 0.01.
