A DNase activity was found associated with isolated components of adenovirus types 5 and 7. The enzymatic activity was associated with the purified virus and viral components extracted from the soluble material of infected cells. The DNase activity of adenovirus type 5 was maximum at pH 5.5 and 7.0 whereas adenovirus 7 was active only at pH 7.0. Both DNases were shown to be located in the penton fraction.
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