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Serum PRN titers from mice i.m. immunized with DNA vaccines encoding MV-H and/or MV-F. Sera from the experiment outlined in Fig. 4 were assessed for their ability to neutralize MV replication in Vero cells using the plaque reduction neutralization assay. PRN titers were measured using sera prepared on days 0 and 56. Responses are expressed as GM titers (mIU/ml) ± SD.
