Figure 5
From: Exceptional error minimization in putative primordial genetic codes
A 2-letter code consisting of 16 supercodons assigned according to the list of the 'early' amino acids (1), the parsimony principle, and the '4-column' theory. Dark green cells are those that are assigned in Fig. 1, and question marks in Fig. 1 are replaced with amino acid assignments from the respective column.