As a preliminary study to investigation of the possible role played by basic proteins in the genetic regulation of virus-infected cells, acid-extractable proteins synthesized during pseudorabies virus infection were investigated. The synthesis of histones was found to decrease in a gradual manner, and arrest was complete by 6 hr after infection. Five virus-induced acid-extractable proteins appeared in nuclei of infected cells after 4 hr of infection. Four of these proteins were virus structural proteins; one was not. All these proteins contained tryptophan and, therefore, were not "classic" histones.
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Stevens et al. (1969) studied this question.
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