Inner circle signifies first nucleotide in codon, second circle signifies second nucleotide in codon, third circle signifies third (wobble) nucleotide in codon. Outer circle signifies corresponding amino acid.
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amino acid properties
Quantitive relative distribution of amino acid physico-chemical properties. A total of 26 physicochemical descriptors are condensed into the two top principal components, capturing >60% of the information. Reference Sandberg et al., J Med Chem 1998, 41:2481