1. Local Mutagenesis: A Method for Generating Viral Mutants with Base Substitutions in Preselected Regions of the Viral Genome

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2. Letter from Daniel Nathans to Janet E. Mertz

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3. Letter from Janet E. Mertz to Daniel Nathans

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4. Letter from U.S. Representative Ray Thornton to Daniel Nathans

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5. Letter from David McConnell to Daniel Nathans

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6. Letter from Daniel Nathans to David McConnell

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7. Draft of letter on recombinant DNA legislation (with edits by Daniel Nathans)

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8. Letter from Paul Berg to Daniel Nathans

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9. The Recombinant DNA Act

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10. Letter from Daniel Nathans to Aaron J. Shatkin

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11. Letter from Aaron J. Shatkin to Daniel Nathans

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12. Lab notes on transformation of BALB 3T3

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13. Lab notes of electron microscopic images of E. coli B DNA

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14. Lab notes on identifying SV 40 proteins in infected cells

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15. Lab notes on determining fragments made by Hind on SV 40 DNA

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16. Letter from Daniel Nathans to Kathleen J. Danna

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17. Letter from Kathleen J. Danna to Daniel Nathans

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18. Specific Cleavage of Simian Virus 40 DNA by Restriction Endonuclease of Hemophilus Influenzae

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19. Letter from Roy D. Schmickel to Daniel Nathans

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20. Letter from Roy D. Schmickel to Ching-Juh Lai

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