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Envelope-specific IgM antibody responses in infants born to SHIV-infected dams. IgM endpoint titers were determined against (A) rgp120 from HIVSF162 and (B) rgp160 from HIV89.6. The solid horizontal line indicates plasma dilutions of 1:50, the assay detection limit. Ab titers of <50 are graphed as 25. Endpt, endpoint. The error bars represent standard deviations of IgM titers from three independent experiments.
