Although over 95% of normal L cells in cultures 3 to 5 days old are stained by brilliant cresyl blue, cells infected with vaccinia virus tend to remain unstained. This tendency may develop 2 hr after infection and increase to involve most of the cells.

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This work was supported by Grant RG5177 from the Division of Research Grants, U. S. Public Health Service.

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Copyright, 1961, by The Williams & Wilkins Company
Copyright © 1961 by The American Association of Immunologists, Inc.
1961
The Williams & Wilkins Company