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Immunoblot analysis of reactivity of human sera against lysates of N. caninum (N), T. gondii (T), and Vero cells (V). The serum used to probe each blot is shown at the bottom. Strong bands of reactivity in the 35-kDa range are apparent with N. caninum lysates treated with either human serum sample. This reactivity is absent in lanes containing Vero cell or T. gondii lysates. Molecular masses are indicated in kilodaltons.
