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Recognition of 2-h schistosomula and cercariae by serum antibodies of immunized mice. C57BL/6J mice were immunized i.n. twice with recombinant 9B peptide-1-expressing flagella (empty symbols) or native flagella (filled symbols). ELISA plates were coated with a 10-μg/ml concentration of lysate of either 2-h schistosomula (squares) or cercariae (circles). O.D., optical density.
