Fig. 1.

Fujimoto's tetrahedral codon stereo-table, a genetic code's representation that seems non-random in relation to codon directional asymmetry. The tetrahedron has four equal, equilateral faces (A–D), and consist each of 16 equilateral triangles representing each one codon. Red circles: CDA < 0; blue squares: CDA > 0. (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)

Adapted from Fig. 1 at http://www.google.com/patents/US4702704.