after fusion of ehrlich ascitic carcinoma cells infected with fowl plague virus and labelled with 3h-uridine with unlabelled chicken fibroblasts infected with fowl plague virus heterokaryons produced virus structures with densities of 1.29 g/ml and 1.22 g/ml which had even higher infectious activity ( 8.6 x 10 ( 8 ) pfu/ml ) than the structures produced by infected ehlrich ascitic cells .
C0016030
fibroblasts
C0007634
cells