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Correlation between Codon Bases in Codons of 113 Species. The frequency of the four possible nucleotide bases (A, T, G, G) in the 3 possible codons positions (1st. 2nd, 3rd) were counted in 113 codon usage tables and plotted against each other. A1+T1 > A3 means the correlation between the sum of the 1st A plus 1st T frequencies and the 3rd A frequency (n = 113).
