The "calcium/dimethyl sulfoxide shock" method of transfection was adapted for use in human lymphoid cell cultures. One microgram of herpes simplex virus type 1 DNA regularly initiated virus replication in four lymphoblastoid cell lines. Per 10(5) cells exposed to 1 microgram of DNA, 0.5--5 cells formed an infectious center. The minimal infective dose of DNA was approximately 500 ng.
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Miller et al. (1979) studied this question.
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