 It is important not to confuse the genetic code and genetic information. The genetic code refers to the relation between three bases of DNA, called a “codon”, and one amino acid. Tables available in molecular biology textbooks (e.g., Watson et al. 1988: frontispiece) show the relation between 64 codons and 20 amino acids. For example, CAC codes for histidine. Only a few exceptions for these coding relations have been found, in a few anomalous cases (see the list in a small table in Alberts et al. 2002: 814). In contrast, genetic information refers to the linear sequence of codons along the DNA, which (in the simplest case) are transcribed to messenger RNA, which are translated to linearly order the amino acids in a protein.