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Cytotoxicity of various isogenic mutants of strain PA103 for corneal epithelial cells measured by trypan blue staining. (A) PA103 exoT::Tc (exoT); (B) PA103 exoU::Tn5Tc (exoU); (C) complementation of exoU by pUCPexoU (PA103 exoU::Tn5Tc pUCPexoU); (D) vector control strain, PA103 exoU::Tn5Tc pUCP18.
