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Tumorigenesis in viruses lacking USP activity is severely impaired. Marek's disease incidence was evaluated over the course of 92 days in two experiments (A and B) and is shown as a percentage of Marek's disease incidence for each group separated by lymphoma incidence. Lymphoma incidence show the percentage of chickens of each group that failed to develop lymphomas (0, white) or chickens in which less than (≤2, gray) or more than (>2, black) two sites of lymphoma manifested.
