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Plaque phenotypes of parental virus strains and hybrid virus progenies in IEC-6 cells. Confluent IEC-6 cells were infected with the respective viruses and the HA expression was monitored at 36 hpi by immunoperoxidase staining of fixed cells. The panels show representative fields at approximately × 200 magnification. CPXV-NOHI (A), MVA-HANP (B), Rec 1(C), Rec 2 (D), Rec 3 (E), Rec 3a (F), Rec 3b (G).
