Paper Reports that Amino Acids Used by Life Are Finely Tuned to Explore "Chemistry Space"

A recent paper in Nature's journal Scientific Reports, "Extraordinarily Adaptive Properties of the Genetically Encoded Amino Acids," has found that the twenty amino acids used by life are finely tuned to explore "chemistry space" and allow for maximal chemical reactions. Considering that this is a technical paper, they give an uncommonly lucid and concise explanation of what they did:

[W]e drew 108 random sets of 20 amino acids from our library of 1913 structures and compared their coverage o...