These three laboratory notebooks from geneticist Philip Leder (1934- ) were used while he was a postdoctoral researcher working with Marshall W. Nirenberg (1927- ). Leder and Nirenberg developed an experiment in 1964 to allow the mapping of tri-nucleotide sequences, or codons, with amino acids, and help to decipher the genetic code.

All three codons notebooks have been fully digitized and are now freely available to researchers through the HOLLIS catalog.

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