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Impaired immune responses against recombinant Pvs28 in mice with an H-2b haplotype. Two sets of congenic strains, B10 (top) and BALB background (bottom), were immunized with Pvs28, and antibody responses of the sera to Pvs28 were analyzed. Sera were collected from five mice and pooled 2 weeks after the third immunization. Experimental details are as for Fig. 3. OD, optical density.
