Virus zone was collected from centrifuged tube and dialyzed at 4 C for 16 h in 0.003 M NaeK phosphate buffer, pH 7.0. The purified virus preparation was kept in a 20 C freezer.
Virus zonewas collected from centrifuged tube and dialyzed at 4 C for 16 h in0.003 M NaeK phosphate buffer, pH 7.0. The purified virus preparationwas kept in a 20 C freezer.