LMTK cells infected with u.v.-irradiated herpes simplex virus type 1 have been selected for the presence of the enzyme thymidine kinase. These cells have an altered morphology compared to the control cells and contain herpes-specific antigens in their cytoplasm.

The thymidine kinase activity present in these cells has been shown, on the basis of a number of biochemical properties, to be identical to the herpes virus specified deoxypyrimidine kinase found during lytic infection of this virus. In addition it has been possible to detect herpes simplex-specific RNA sequences in the transformed cells and this occurs in both the polyadenylated and non-polyadenylated cytoplasmic and nuclear fractions.


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