The genetic code [is] written in the four-letter alphabet, "A", "G", "C", "T." Here, then, floating in the nuclear sap, is the code which governs the skill of creating a six-foot drum major with a slight squint and dimpled cheeks out of an egg with a diameter of a few microns.

The Act of Creation, Book Two, Chapter I (p. 417), The Macmillan Company. 1964