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Recovery of bacteria from spleens of BALB/c mice following sublethal infection with wild-type L. monocytogenes (•), the dal dat mutant in the absence of d-alanine (○), and the dal dat mutant in the presence of 20 mg of d-alanine in the inoculation fluid (□). The points at day 0 show the total number of viable organisms injected, not bacteria per spleen.
