Figure 5
From: Testing for adaptive signatures of amino acid alphabet evolution using chemistry space
The frequency with which random sets of 10 amino acids exhibit better coverage (range and evenness) than the early amino acids in each of three molecular descriptors and all combinations of these descriptors. Of particular note, when two or more dimensions of amino acid chemistry space are considered simultaneously, far less than 1% of random amino acid sets of size 10 match the coverage of the early amino acids.