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851. Letter from Jerry Donohue to Francis Crick

854. What Is a Gene?

855. Comma-less Codes: A Note for the RNA Tie Club

856. Letter from Francis Crick to William Shockley

857. Letter from Francis Crick to William Shockley

858. Letter from Francis Crick to William Shockley

859. Letter from Aaron Klug to Francis Crick

860. Letter from Francis Crick to Charlotte Friend