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Morphological characterization of wild-type P. multocida, ACP13, and ACP17. Electron micrographs of negatively stained (A) wild-type P. multocida, (B) ACP13 mutant, (C) ACP13 cell undergoing replication, and (D) ACP17 complemented mutant. The arrows (D) indicate small cells that are assumed to be those that have lost the pACP1007 plasmid with the functional pnhA and are thus exhibiting the mutant phenotype (B, C). The TEM micrographs were taken at magnification ×20,000.
