Figure 8

Error minimization level of 2-letter codes. (a) A 2-letter code obtained using the parsimony principle. For the cells with an ambiguous assignment, one random amino acid is chosen; (b) The distribution of the costs of the random 2-letter codes obtained by permutation of amino acid assignments in (a), the green lines shows the cost of the code from (a), the red line shows the mean, and the blue line shows the cost of the optimum; MP = 0.51, the distance from the mean is 2.6 standard deviations.