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Reactivities of human antibodies to rRh4.9. The reactivity of human IgG to rRh4.9 was measured by ELISA using purified rRh4.9 protein. All samples were tested in duplicate and adjusted for background reactivity. The error bars represent the ranges of two duplicates. The samples tested were from malaria-exposed residents of Madang, Papua New Guinea (numbered samples), and nonexposed Melbourne residents (M1 to M7). OD 405, OD at 405 nm.
