West Nile virus replication complexes were partially purified from cytoplasmic extracts of virus-infected cells by centrifugation through a 20% glycerol cushion. Numerous cell proteins, as well as the largest nonstructural protein, NS5, were separated from the replication complexes without significant loss of in vitro West Nile virus polymerase activity.
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Grun et al. (1987) studied this question.
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