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1F. H. Portugal and J. S. Cohen, A Century of DNA: A History of the Discovery of the Structure and Function of the Genetic Substance (Boston: MIT Press, 1979).
2An isotope is one of two or more atoms with the same atomic number, but with different numbers of neutrons and different molecular weights.
3James D. Watson, DNA: The Secret of Life (New York: Alfred A. Knopf, 2003).
4Gerald Karp, Cell and Molecular Biology: Concepts and Experiments (Hoboken, NJ: John Wiley & Sons, 2008).