Figure 7
From: Testing for adaptive signatures of amino acid alphabet evolution using chemistry space
A visual exploration of fundamental metabolites and the chemistry space of the genetically encoded amino acids. A 2-dimensional plot of chemistry space using size (ACD Molar Volume) against hydrophobicity (ACD LogP) for the 20 amino acids of the standard genetic code, indicated by their standard one-letter abbreviations. Early amino acid dimers are represented as green triangles. Other core metabolites are plotted including nucleobases (a = adenine, c = cytosine, g = guanine, u = uracil), ribonucleosides (a* = adenosine, c* = cytidine, g* = guanosine, u* = uridine), and sugars (gl = glucose; ri = ribose).