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Relationship of the reactivities of the syphilis patient sera to the MHA-TP test and to recombinant T. pallidum proteins. The mean absorbance values at 600 nm for reactivities of the recombinant Tp0453, Tp92, and Gpd proteins are shown on the y axis. The x axis displays the value for the MHA-TP test (microhemagglutination assay with T. pallidum crude antigen), shown as the reciprocal of the highest dilution tested that gave reactivity in the test on a log2 scale.
