Propagation of MM Virus in L Cells

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Abstract
MM virus (mouse-brain stock) replicated to a limited extent in L cells without cytopathic effects; the average yield was less than 1 plaque-forming unit/cell. Passage in BHK-21 cells resulted in MM virus [MM(BHK)] which replicated to high titers (200 to 300 plaque-forming units/cell) in L cells with complete cytopathic effects. Appearance of mature MM(BHK) virus in L-cell cultures begins 4 hr after infection and is completed by 8 hr. Release of mature virus was slow (less than 1% at 8 hr) but was completed by 24 hr.

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