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In vitro neutralization assays of PsV-16 (A) and PsV-18 (B) by sera of mice immunized with dual-type L2 17-36 × 3 peptide. Neutralizing titers were represented as the reciprocal of the highest sera dilution at which at least 50% of the pseudovirions were neutralized compared to the positive control (pseudovirion without sera). End point titers were plotted and means represented as horizontal lines. A neutralizing titer lower than 50 was regarded as not detectable (ND).
