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Department of Veterinary Pathology Royal (Dick) School of Veterinary Studies, Edinburgh EH9 1QH U.K.
The neuraminidase content of purified virus particles of three velogenic strains of Newcastle disease virus was compared with that of three lentogenic strains. Velogenic strains possessed approximately three times as much enzyme as lentogenic strains.
Received 9 December 1974;
accepted 14 February 1975.
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