The New England Journal of Medicine Downloaded from nejm.org on October 22, 2015. For personal use only. No other uses without permission. Copyright © 1991 Massachusetts Medical Society. All rights reserved.

Lack of SV40 DNA in tumors from scientists working with SV40 virus.

The New England Journal of Medicine Downloaded from nejm.org on October 22, 2015. For personal use only. No other uses without permission. Copyright ©...
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