Figure 10

Error minimization levels of 2-letter codes. (a) A 2-letter genetic code obtained using the parsimony principle. For the cells with ambiguous assignment, one random amino acid is chosen; two supercodons, UAN and UGN, are disregarded; (b) The distribution of the costs of random 2-letter codes obtained by permutation of amino acid assignments in (a), the green line shows the cost of the code in (a), the red line shows the mean, and the blue line shows the optimum; MP = 0.88, the distance from the mean is 3.7 standard deviations.