One important use of informational language is relatively uncontroversial, through being anchored in striking and well established facts about the role of DNA and RNA in the manufacture of protein molecules in cells, a set of facts summarized in the familiar chart representing the “genetic code”, that maps triplets of the DNA bases (C, A, T, G) to individual amino acids, which are the building blocks of protein molecules. Not even this use of “coding” language is completely uncontroversial (Sarkar 1996). More importantly, enthusiasm for the use of informational language in biology both predates the discovery of the DNA-RNA-amino acid mapping (Schrödinger 1944), and goes far beyond it, so this mapping is only a partial explanation of the uptake of informational notions in biology. Current applications of informational concepts in biology include: