18 These procedures have been found to release 85% of the acid-precipitable DNA (labeled with tritiated thymidine) from adenovirus type 2 particles mixed with 108 nonradioactive KB cells.Furthermore, 90% or more of the acid-precipitable, tritiated thymidine-labeled material from adenovirus type 2 infected KB cells (exposed to tritiated thy ridine 12-24 hr after virus inoculation) and uninfected KB cells, similarly labeled, %as recoxered by these procedures. 19 Green, M., in Cold Spring Harbor Symposia on Quantitative Biology, vol. 27 (1962), p. 219. 20 As measured by the homology technique, there was no detectable adenovirus type 2 DNA synthesis (less than 1% of that in control cultures) in infected KB cells treated with 2 X 10-5 M FUDR. 21 Black, P. H., E. M. Crawford, and L.
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