FIG. 4.

Southern blot analysis of DNase-treated DNA from KOS- and hr64-infected Vero cells. Total DNA extracts from KOS or hr64 were treated with DNase I and subsequently digested with BamHI as described under Materials and Methods. The samples were collected at the end of a 1-h incubation time (time zero) and at 2, 4, 6, 8, and 16 h postinfection.