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Start Over You searched for: Creator Nathans, Daniel, 1928-1999 ✖ Remove constraint Creator: Nathans, Daniel, 1928-1999 Language English ✖ Remove constraint Language: English Format Text ✖ Remove constraint Format: Text Subject Simian virus 40 ✖ Remove constraint Subject: Simian virus 40 Periodical Proceedings of the National Academy of Sciences of the United States of America ✖ Remove constraint Periodical: Proceedings of the National Academy of Sciences of the United States of America Exhibit Tags enzymes ✖ Remove constraint Exhibit Tags: enzymes