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Start Over You searched for: Creator Ward, David C. ✖ Remove constraint Creator: Ward, David C. Creator Imperial Cancer Research Fund (Great Britain). Laboratories ✖ Remove constraint Creator: Imperial Cancer Research Fund (Great Britain). Laboratories Format Text ✖ Remove constraint Format: Text Subject DNA ✖ Remove constraint Subject: DNA Subject Simian virus 40 ✖ Remove constraint Subject: Simian virus 40 Genre Letters (correspondence) ✖ Remove constraint Genre: Letters (correspondence) Year 1971-01-13 ✖ Remove constraint Year: 1971-01-13