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(A) Microscopy of atl mutant, complementation, and wild-type S. suis 2. Log phase bacteria were treated with Gram stain, and the three strains were imaged under the same magnification scale. (B) Sedimentation of bacteria cultured in THB for 16 h. The arrows indicate the sedimented cells at the bottom of tubes. Tube 1, wild-type strain HA9801; tube 2, the Δatl mutant strain; tube 3, the Δatl complement strain.
