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Start Over You searched for: Creator National Institutes of Health (U.S.) ✖ Remove constraint Creator: National Institutes of Health (U.S.) Creator Fredrickson, Donald S. ✖ Remove constraint Creator: Fredrickson, Donald S. Language English ✖ Remove constraint Language: English Format Text ✖ Remove constraint Format: Text Subject Plasmids ✖ Remove constraint Subject: Plasmids Genre Letters (correspondence) ✖ Remove constraint Genre: Letters (correspondence)