Electron micrographs of the binding of human vitronectin to complement-resistant (left) and complement-sensitive (right) strains of M. catarrhalis. Electron.

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Electron micrographs of the binding of human vitronectin to complement-resistant (left) and complement-sensitive (right) strains of M. catarrhalis. Electron micrographs of the binding of human vitronectin to complement-resistant (left) and complement-sensitive (right) strains of M. catarrhalis. Immunogold labeling using antibodies specific for human vitronectin revealed that this protein is effectively bound to the resistant cells whereas the sensitive strain fails to bind a significant quantity of the human matrix protein. Note that the vitronectin protein seems to be attached toward the boundaries of the cellular matrix, which may correlate with the protruded orientation of the vitronectin-binding ubiquitous surface proteins (UspA). Cees M. Verduin et al. Clin. Microbiol. Rev. 2002; doi:10.1128/CMR.15.1.125-144.2002