FIG. 3.

Neutralization of PM2 virions with anti-P1 serum (filled circles) and anti-P2 serum (filled triangles). P1 preimmune serum (open circles) and P2 preimmune serum (open triangles) were used as negative controls. Purified P2 protein used for the production of polyclonal anti-P2 serum is shown on a Coomassie brilliant blue-stained SDS-polyacrylamide gel (lane 1). The specificities of anti-P1 serum (1:20,000 dilution) and anti-P2 serum (1:100,000 dilution) are shown in lanes 2 and 3 (Western blots). The positions of proteins P1 and P2 determined from the corresponding Coomassie brilliant blue-stained gel are indicated on the left.